In the island they have discovered traces of an ancient settlement, which some archaeologists tend to identify with the town of Perraiotan. In the west side of the island, there is a small island called Plati, a part of which forms a separate rock-islet, named Nekrothiki. All the coasts are ideal for swimming, with the most exceptional one being the Vathy bay. Pserimos is located 6 n.m. SE away from Kalymnos island.