The word "loch" is a Scottish Gaelic word that means "lake". It is used to refer to large, freshwater bodies in Scotland, Ireland, and the Isle of Man. The word "lake" is the English word for a large, freshwater body.
Loch Ness is a large, freshwater lake located in the Scottish Highlands. It is the second largest loch in Scotland by volume and the largest by surface area. Loch Ness is famous for its alleged monster, the Loch Ness Monster, or Nessie.