Fact · North Uist
No loch in Britain has a more complicated shoreline than Loch Sgadabhagh
Loch Sgadabhagh on North Uist is so riddled with bays, arms and islands that it has been said 'there is probably no other loch in Britain which approaches it in irregularity and complexity of outline'. Loch Obisary nearby holds twice as much water.
Much of North Uist is water. Its lochs are so numerous and so tangled that some of them mix fresh water with tidal salt water, creating habitats found almost nowhere else. Loch Sgadabhagh, beside the Lochmaddy road, is the largest by area, and its shoreline is famously impossible to follow: 'there is probably no other loch in Britain which approaches Loch Scadavay in irregularity and complexity of outline'. Loch Obisary, further south, holds about twice the volume of water.
Sources / notes: Wikipedia: North Uist https://en.wikipedia.org/wiki/North_Uist