A loch was a Scottish lake. The largest loch was Loch Ness in the Great Glen. (PROSE: The Secret Lives of Monsters)
Jamie McCrimmon once saw a flock of starlings over a loch. (AUDIO: The Elysian Blade)
Dead Loch was named as such due to chemical weapons testing which were conducted within it during the Second World War. As a result of these tests, all the fish in the loch died and it remained emptied of wildlife for decades, with even birds avoiding it. (PROSE: Harry Sullivan's War)