The Lasithi Plateau is a high endorheic plateau, located in the Lasithi regional unit in eastern Crete, Greece. Since the 1997 Kapodistrias reform, it is a municipality whose seat is Tzermiado and the second biggest village is Agios Georgios. The municipality has an area of 129.9 km2.

An endorheic basin is a drainage basin that normally retains water and allows no outflow to other, external bodies of water ; instead, the water drainage flows into permanent and seasonal lakes and swamps that equilibrate through evaporation. Endorheic basins are also called closed basins, terminal basins, and internal drainage systems.