Cirein crôin is a sea serpent in Scottish Mythology. It is believed to be the largest of all living and legendary creatures capable of eating seven whales for a meal.
- “Seven herrings are a salmon’s fill,
- Seven salmons are a seal’s fill,
- Seven seals, are a whale’s fill,
- Seven whales are the fill of a Cirein Crôin
- And seven Girein Crôin are the fill of the big devil
- himself.” — Caithness Rhyme.