This category is for geographical websites devoted to the longest river in the UK, with its source above the Hafren Forest in North Wales, flowing through the English Midlands and flowing through Gloucestershire, with its tidal bore at its mouth, to the Bristol Channel between England and Wales, spanned by the Severn Suspension Bridge at Cheptow, and the Second Severn Crossing, at Caldicot, where the railway tunnel also emerges.