As it stands (and dont write in) its the Cuckmere River in Sussex at 5 miles (8 km) the River Bain in Lincolnshire at 4 miles (6.4 km) and, last but by no means least, the River Morar on the West Coast of Scotland at barely a kilometre long. There is no evidence that humans have ever swum in the sea in Wales. Looking for a perfect place to picnic, relax, think, run, walk your dog and more, all for free? I assume you mean England. The River Morar is a river that flows from Loch Morar in the west Highlands of Scotland. Azuis River or Blue river flows for 147 m in the city of Aurora do Tocantins, Brazil. How do I move data from one tab to another in Excel?