Dereium
Dereium or Dereion, also known as Dera and Derrhium or Derrhion, 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.
Its site is unlocated.