Oligotrophic lakes

lake in Highland, Scotland, UK, outflows via Loch Dochfour to the River Ness and Caledonian Canal

freshwater loch in Lochaber, Highland, Scotland, UK, outflows at its west to the River Morar

lake in Highland, Scotland, UK, outflows to the River Ewe

freshwater loch in Ardnamurchan, West Highlands of Scotland, UK, outflows to the River Shiel

lake in the United Kingdom

Buttermere is a lake in the Lake District in North West England. It has a length of approximately and a maximum width of , an area of , a maximum depth of , and a surface elevation of above sea level. Its primary outflow is Buttermere Dubs, a short stream which connects the lake to Crummock Water. From Crummock Water the River Cocker flows to Cockermouth, where it joins the River Derwent and finally enters the Irish Sea at Workington. The lake is in the unitary authority of Cumberland, and the ceremonial county of Cumbria.

reservoir in the United Kingdom

lake in East Ayrshire, Scotland, UK, outflows to the River Doon

lake in Cwm Idwal, Conwy County Borough, Wales

lake in Dumfries and Galloway, Scotland, UK

lake and Site of Special Scientific Interest in Wales

reservoir lake in Gwynedd, Wales

freshwater lake in Highland, Scotland, UK, on the River Coe

lake in East Ayrshire, Scotland, UK, outflows east to Black Garpel