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Loch Ness is a large, deep, freshwater loch in the Scottish Highlands extending for approximately 23 miles along what is called Glen Mor, or The Great Glen, a 60-mile fissure which was gouged out by glaciers during the last ice age and runs from Inverness in the north to Fort William in the south.

The Loch itself is the second largest Scottish loch by surface area at 22 square miles but is the largest by volume in the British Isles due to its great depth; it is over 700 feet deep, and the nearby surrounding hills rise by about the same amount. Its water visibility is exceptionally low due to a high peat content in the surrounding soil.