Length of Windermere 10.5 miles (UK) Length of Ullswater 7.3 miles (UK) Length of Coniston 5.25 miles (UK) Loch Lomond 4 person Relay 24.2 miles (UK) IWSA International Relay Swim across the Rio de la Plata from Colonia, Uruguay to Puerto Madero, Buenos Aires in Argentina Several IWSA/IISA Winter Swimming events, Patagonia, Estonia, Slovenia, Latvia, UK