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  1. Home
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  4. Cefn Onn to Machen and Mynydd Machen

Cefn Onn to Machen and Mynydd Machen

Start:
Estimated Finish:
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Cardiff Group

We are the Cardiff Ramblers. We open the way for everyone in our local community to enjoy the pleasures of walking.

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  • a library jam-packed with thousands of tried-and-tested routes
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Overview

Cross country from Parc Cefn Onn on various paths through woods and countryside to Draethon and by Rhymney river to Machen - 6 miles.  Ascend from the village to Mynydd Machen 1187ft for wonderful views (when a clear day!) North to Bannau Brycheiniog, East to Twmbarlem, South Newport, Bristol Channel, Flat and Steep Holm and west to Garth. Descend to contour around on the north side to Penrhiw lane and steep descent to Machen to catch a bus back to Caerphilly for a train or bus back to the start.

Bus from Machen to Caerphilly approx. every half hour. 

Train or bus back to Lisvane (Parc Cefn Onn)

Walkers are asked to carry In Case of Emergency information, this might be on a card, key fob or on their smartphone.

Wednesday, 14 May 2025
Start time:
9:30 am
Estimated finish time:
3:30 pm
Difficulty:
Moderate
Distance:
17.7km / 11.0mi
Ascent:
457.2m / 1500ft
Type:
linear
Website:
https://www.cardifframblers.org.uk/walks

Local Grade: B

 

Starting point

Grid reference:
ST 17931 83542
Nearest postcode:
CF14 0UE
what3words:
flight.beside.belt
Start time:
9:30 am

entrance gate to Parc Cefn Onn

Finishing point

Grid reference:
ST 21467 89127
Nearest postcode:
CF83 8SA
what3words:
pasting.chairing.surprises
Estimated finish time:
3:30 pm

Bus stop Graig View, Machen to Caerphilly then bus or train back Lisvane/Thornhill to Parc Cefn Onn

Upcoming walks with Cardiff Group

Join the walk.

Longwood Drive Circular

Start:

Difficulty:
Leisurely
Distance:
6.0 miles
Join the walk.

Hills and woods of Cardiff

Start:

Difficulty:
Moderate
Distance:
12.4 miles
Rail Ramble

Rail Ramble. Llantwit Major, Colhuw Beach and Llanmaes. Register with Walk Leader.

Start:

Difficulty:
Moderate
Distance:
8.0 miles
Cancelled Walk

Cancelled: Abersychan, Cwmteleri and Coety mountain.

Start:

Difficulty:
Moderate
Distance:
11.0 miles
Join the walk.

Cardiff Central Strollers visit Insole Court. Linear.

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
View from Cefn Llechid

Cefn Llechid. Led by Susan B.

Start:

Difficulty:
Moderate
Distance:
8.0 miles
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Caerphilly and the Rhymney Valley Ridgeway

Start:

Difficulty:
Moderate
Distance:
10.9 miles
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Nantgarw Circular

Start:

Difficulty:
Leisurely
Distance:
6.0 miles
Join the walk.

Craig Yr Allt Area

Start:

Difficulty:
Moderate
Distance:
10.0 miles
Placeholder image

Pen y Fan South Circular. Numbers limited, please register with Walk Leader.

Start:

Difficulty:
Strenuous
Distance:
11.0 miles
Placeholder image

Claire's Friday Morning Parc Cefn Onn Walk (woods, hills, countryside)

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Join the walk.

Cardiff Central Strollers: Pontcanna and Llandaf Fields Circular

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
Join the walk.

Rest Bay and Kenfig Nature Reserve

Start:

Difficulty:
Leisurely
Distance:
8.0 miles
View from Mynydd y Cymmer

Trehafod, Porth and Dinas

Start:

Difficulty:
Strenuous
Distance:
10.0 miles
Placeholder image

Cancelled: Waterfall Country from Pontneddfechan. Please Register with Walk Leader

Start:

Difficulty:
Moderate
Distance:
11.0 miles
Join the walk.

Penarth Circular

Start:

Difficulty:
Leisurely
Distance:
6.0 miles
Rail Ramble

Part 4: Rhymney Riverside walk Machen to Llanbradach. Linear.

Start:

Difficulty:
Moderate
Distance:
8.0 miles
Parc Cwm Darran

Parc Cwm Darran, Cefn y Brithdir, Cefn Gelligaer. Please register with walk leader.

Start:

Difficulty:
Moderate
Distance:
11.0 miles
Placeholder image

Claire's Friday Morning Parc Cefn Onn Walk (woods, hills, countryside)

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Join the walk.

Cardiff Central Strollers: Cardiff Bay.

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
Join the walk.

Roath Park Circular

Start:

Difficulty:
Leisurely
Distance:
6.0 miles
Placeholder image

Ogmore Forest

Start:

Difficulty:
Moderate
Distance:
13.0 miles
Join the walk.

Wenallt Woods Circular

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Above Mitchel Troy

Mitchel Troy to Penallt. Please register with Walk Leader.

Start:

Difficulty:
Moderate
Distance:
11.0 miles
Join the walk.

Llanvihangel Ystern Llewern. Register with Walk Leader.

Start:

Difficulty:
Moderate
Distance:
7.0 miles
Join the walk.

Blaen y Glyn circular. Numbers limited, please register with Walk Leader.

Start:

Difficulty:
Strenuous
Distance:
13.0 miles
Placeholder image

Claire's Friday Morning Parc Cefn Onn Walk (woods, hills, countryside)

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Join the walk.

Cardiff Strollers: Pentwyn.

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
Join the walk.

Ogmore by Sea. Vale Trails Walk 1

Start:

Difficulty:
Moderate
Distance:
8.0 miles
Placeholder image

Around Caerphilly Mountain

Start:

Difficulty:
Moderate
Distance:
9.0 miles
Join the walk.

Cardiff Central to Llandaff North via Insole Court. Linear.

Start:

Difficulty:
Leisurely
Distance:
6.0 miles
Join the walk.

Southerdowm, Coed y Bwl, Ogmore

Start:

Difficulty:
Moderate
Distance:
9.0 miles
Forest of Dean

Forest of Dean Rail Ramble from Lydney

Start:

Difficulty:
Strenuous
Distance:
15.0 miles
Placeholder image

Llantwit Major, Gileston and coast

Start:

Difficulty:
Moderate
Distance:
12.0 miles
Placeholder image

Cardiff Central Strollers: Guest Leader

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
wiggly wood

Darran Valley 10 Trail

Start:

Difficulty:
Moderate
Distance:
10.5 miles
Placeholder image

Nant y Draenog and Gelligroes Mill. Please register with walk leader.

Start:

Difficulty:
Moderate
Distance:
10.0 miles
Join the walk.

Roath Park Circular

Start:

Difficulty:
Leisurely
Distance:
6.0 miles
Placeholder image

Llanover Loop

Start:

Difficulty:
Moderate
Distance:
10.0 miles
Placeholder image

Forest of Dean

Start:

Difficulty:
Strenuous
Distance:
13.0 miles
Placeholder image

Claire's Friday Morning Parc Cefn Onn Walk (woods, hills, countryside)

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Placeholder image

Cardiff Central Strollers: Bute Park

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
Placeholder image

St Brides Major. Vale Trails Walk 10

Start:

Difficulty:
Moderate
Distance:
8.0 miles
Placeholder image

Carn Pica from Pencelli. Please register with walk leader.

Start:

Difficulty:
Strenuous
Distance:
11.0 miles
Join the walk.

Newport Wetlands Circular

Start:

Difficulty:
Leisurely
Distance:
8.0 miles
Bus Interchange

CBI Linear: St Fagans to The Pumping Station (along the Ely Trail)

Start:

Difficulty:
Leisurely
Distance:
6.0 miles
View from Craig Pen-rhiw-llech

Parc Cwm Dare via Maerdy and Cwmaman. Please register with walk leader.

Start:

Difficulty:
Moderate
Distance:
10.5 miles
Rhoose Point

Rail Ramble and Coastal Walk

Start:

Difficulty:
Strenuous
Distance:
13.0 miles
Placeholder image

Claire's Friday Morning Parc Cefn Onn Walk (woods, hills, countryside)

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Cardiff Central Bus Interchange

Cardiff Central Strollers: International Sports Village Circular.

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
Placeholder image

Haunted Fields Walk, St Nicholas. Vale Trail 7

Start:

Difficulty:
Moderate
Distance:
8.0 miles
Placeholder image

Wye Valley circular via Tidenham Tunnel. Please register with walk leader.

Start:

Difficulty:
Moderate
Distance:
11.8 miles
Join the walk.

Hailey Park to Insole Court

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
Pistyll Goleu waterfall

Rail Ramble: Mountain Ash to Pontypridd. Please register with walk leader.

Start:

Difficulty:
Moderate
Distance:
11.0 miles
Placeholder image

Rob Smith Wye Valley Walk

Start:

Difficulty:
Strenuous
Distance:
13.0 miles
Parc Cefn Onn

Guest Leader Jean B. Friday Morning Parc Cefn Onn Walk (woods, hills, countryside)

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Cardiff Central Bus Interchange

Cardiff Central Strollers take the Porth Teigr Way.

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
Safest way to access layby on A468

Rhymney River Circular. Register with Walk Leader.

Start:

Difficulty:
Moderate
Distance:
7.0 miles
Placeholder image

Sugar Loaf from Abergavenny. Please register with walk leader (text preferred)

Start:

Difficulty:
Moderate
Distance:
11.2 miles
Join the walk.

Penarth Pier and Barrage

Start:

Difficulty:
Leisurely
Distance:
6.0 miles
Join the walk.

Cross Keys to Cwm Felin fach and Mynydd y lan

Start:

Difficulty:
Moderate
Distance:
9.0 miles
Placeholder image

Wye Valley: Castles and Bluebells. Please register with walk leader

Start:

Difficulty:
Moderate
Distance:
10.5 miles
Join the walk.

Llanfrynach circular via Cribyn & Fan y Big. Numbers limited, please register with Walk Leader.

Start:

Difficulty:
Strenuous
Distance:
13.0 miles
Parc Cefn Onn

Guest Leader Carol B. Friday Morning Parc Cefn Onn Walk (woods, hills, countryside)

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Join the walk.

Cardiff Central Strollers: Guest Leader

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
Join the walk.

Penarth Circular

Start:

Difficulty:
Leisurely
Distance:
6.0 miles
Placeholder image

Blaenavon Roundabout. Please register with walk leader.

Start:

Difficulty:
Strenuous
Distance:
13.5 miles
Join the walk.

Barry

Start:

Difficulty:
Leisurely
Distance:
6.0 miles
Join the walk.

Circular from Cefn Onn to Black Cock, Nant y Brynau, Taff Trail & Fforest Fawr

Start:

Difficulty:
Moderate
Distance:
10.0 miles
Placeholder image

Claire's Friday Morning Parc Cefn Onn Walk (woods, hills, countryside)

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Join the walk.

Cardiff Central Strollers: Reservoir Walk from Roath Park.

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
Placeholder image

Craig yr Allt via the Ridgeway

Start:

Difficulty:
Moderate
Distance:
8.0 miles
Placeholder image

Pontypridd Circular

Start:

Difficulty:
Moderate
Distance:
10.0 miles
Join the walk.

Whitchurch to Wenallt Woods looking for bluebells

Start:

Difficulty:
Moderate
Distance:
6.0 miles
river

Coed y Bwnydd Hillfort from Clytha

Start:

Difficulty:
Moderate
Distance:
8.5 miles
Placeholder image

Llynfi and Garw Valleys

Start:

Difficulty:
Moderate
Distance:
12.0 miles
Join the walk.

The Daffodil walk around Sugar Loaf

Start:

Difficulty:
Strenuous
Distance:
13.7 miles
Join the walk.

A wander through the Woods around Castell Coch

Start:

Difficulty:
Moderate
Distance:
5.0 miles
Parc Cefn Onn

Guest Leader Digna: Friday Morning Parc Cefn Onn Walk (woods, hills, countryside)

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Cardiff Central Bus Interchange

Cardiff Central Strollers: Linear to Whitchurch.

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
Placeholder image

Cefn Llechid.

Start:

Difficulty:
Moderate
Distance:
8.0 miles
Placeholder image

Clytha and Bettws Newydd. Please register with walk leader.

Start:

Difficulty:
Moderate
Distance:
9.0 miles
Join the walk.

HaileyPark, Llandaff North

Start:

Difficulty:
Leisurely
Distance:
6.0 miles
Trig on Little Doward

Dowards, the Wye, and King Arthur’s cave. Please register with walk leader.

Start:

Difficulty:
Moderate
Distance:
10.0 miles
Join the walk.

Caerphilly Mountain

Start:

Difficulty:
Leisurely
Distance:
4.0 miles
Parc Cefn Onn

Guest Leader Rob J. Friday Morning Parc Cefn Onn Walk (woods, hills, countryside)

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Cardiff Central Bus Interchange

Cardiff Central Strollers: Cardiff Wetlands & beyond.

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
The 'Old Place' - an Elizabethan mansion.

Historic Llantwit Major and the Heritage Coast

Start:

Difficulty:
Moderate
Distance:
8.0 miles
Placeholder image

A visit to Allt Lwyd. Please register with walk leader.

Start:

Difficulty:
Strenuous
Distance:
13.0 miles
Join the walk.

Wenvoe Circular

Start:

Difficulty:
Moderate
Distance:
8.0 miles
Join the walk.

Cefn Onn to Machen and Mynydd Machen

Start:

Difficulty:
Moderate
Distance:
11.0 miles
Join the walk.

Gwent Valleys. Contact Walk Leader Rob S. (Text 07590 570445) to REGISTER and for walk info.

Start:

Difficulty:
Strenuous
Distance:
12.0 miles
Join the walk.

Roath Park

Start:

Difficulty:
Easy
Distance:
4.0 miles
Parc Cefn Onn

Guest Leader Jean B. Friday Morning Parc Cefn Onn Walk (woods, hills, countryside)

Start:

Difficulty:
Moderate
Distance:
6.0 miles
Join the walk.

Cardiff Central Strollers: Guest Leader

Start:

Difficulty:
Leisurely
Distance:
5.0 miles
river

Coed y Bwnydd Hillfort from Clytha

Start:

Difficulty:
Moderate
Distance:
8.5 miles
Placeholder image

Waterfall Country from Pontneddfechan. Please Register with Walk Leader

Start:

Difficulty:
Moderate
Distance:
11.0 miles

Join the Ramblers and enjoy

  • unlimited free access to 50,000 Ramblers group walks
  • a library jam-packed with thousands of tried-and-tested routes
  • a welcome pack teeming with top tips plus our Walk magazine
  • exclusive discounts from our partners
  • knowing your support is opening up more places to walk and helping more people discover the joy of walking
Join now for just £3.58 per month
Register for an account for FREE