From Openwaterpedia

Bala Lake (Welsh: Llyn Tegid) is a large lake in Gwynedd, Wales. It was the largest natural body of water in Wales prior to the level being raised by Thomas Telford to help support the flow of the Ellesmere Canal. It is 4 miles (6.4 km) long by 1 mile (1.6 km) wide, and is subject to sudden and dangerous floods. The River Dee runs through it and the waters of the lake are famously deep and clear. Bala is the site of a number of open water swims.

Three Lakes Challenge

The 40-mile Three Lakes Challenge (or Loch, Lake, Llyn) is an unprecedented 5-person relay with Sam Plum, Jason Betley, Helen Gibbs, Helen Liddle, and Debbie Taylor on 3-4 July 2015. On 3 July, the team starts a 41 km (25 mile) course across Loch Awe in Bonny, Scotland. They will drive to Windermere and swim across 16.9 km (10.5 miles), and then drive to and swim 4 miles (6.4 km) across Llyn Tegid (or Bala) in Wales.

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