Loch Ness is famous for its fabled Monster is the deepest lake in the British Isles and its mystery is enhanced by the dark peaty colour of its waters. The Caledonian Canal runs from Inverness down the geographical fault line known as the Great Glen. Less than 10 miles southwest, the canal runs into Loch Ness, home to the mysterious monster, ‘Nessie’. Loch Ness which is 24 miles long, one mile wide and can reach depths of over 700ft is the largest body of fresh water in Europe.