Figure of eight walk with car park in the middle, so options exist to either leave at half distance or join half way through.
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Flat coastal walk, the only undulations are the bridges crossing the A27 and the railway, which we do twice before coffee.
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Via Bedhampton Station, Langstone Harbour, and Farlington Marshes. Coffee stop at south end of Southmoor Lane (you can sit on sea wall). Lunch stop near the old Oyster House on Farlington Marshes (you can also sit on the sea wall). Depending on weather, may be refreshing sea breezes, so wrap up well.