Dereium or Dereion (), also known as Dera (ÃÂÃÂÃÂñ) and Derrhium or Derrhion (ÃÂÃÂÃÂÃÂùÿý), was a town of ancient Laconia. Pausanias writes that it was on Taygetus not far from Lapithaeum, and 20 stadia from Harpleia. Dereium possessed an open image of Artemis Dereatis, and a spring called Anonus. The site of the town has not been located.