The largest lake by volume in the UK is Loch Ness, Scotland at 7.30km3. Loch Ness contains more fresh water than all the lakes in England and Wales combined! The largest lake by surface area in the UK is Lough Neagh, Northern Ireland at 38,000 ha.
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The largest lake in the world by a long shot is the Caspian Sea – a name that hints at a past when it was contiguous with the ocean around 11 million years ago. This massive saline lake, which is nearly the same size as Japan, borders five countries: Kazakhstan, Russia, Turkmenistan, Azerbaijan, and Iran.
Loch Ness is the largest body of water in Scotland by volume and contains more water than all the Lakes in England and Wales combined. It is in fact so deep, that Loch Ness never freezes over, even in the harshest of Scottish Winters, as the water cooled from the air will sink and be replaced by hot water below it.