What is the Loch Ness Monster?

Lair of the Beasts: What is the Loch Ness Monster? - Mania.com: "Two-hundred-and-fifty-million years ago, movements in the earth’s crust led to the creation of a huge rift across Scotland that, today, is known as the Great Glen. As the centuries passed, the deeper parts of the Glen filled with water, and it now exists in the form of three main bodies of water: Loch Oich, Loch Lochy, and Loch Ness. For more than a century and a half, they have been connected by the sixty-mile-long Caledonian Canal, which provides a passage for small boats from the North Sea to the Atlantic Ocean."