Pserimos was, along with the surrounding islets, the "Kalidnas islands" as mentioned by Homer. Plinios calls it Pserema, so we know that its name has been around for a long time and has been preserved for centuries.
It has been one of the municipalities of the state of Kos and Kalymnos since antiquity, a fact that is known to us from a resolution of the first half of the 3rd c. A.D. An inscription of the 3rd century stated the name Psirimos with a list of lords of Kos, which testifies to the dependence of the island on Kos.
In recent years, following the fate of the rest of the Dodecanese islands, it was subjugated to the Ottoman Empire in the early 16th century. In 1912 it fell into the hands of the Italians, while in 1948 it was incorporated into the Greek state.
Pserimos is located north of Kos and southeast of Kalymnos, 4.2 nautical miles away from the first and 6 nautical miles southeast of the second. Having 11 islands near it (Plati, Nekropothiki, Exopetra, Krevvatia, Vasiliki, Ligio, Mermigas, Gialos and two anonymous) we can say that it is a multifaceted complex.
The surface of the island is 14.6 km2 with a maximum altitude of 268 meters with only 130 inhabitants.
The northern end of the island is called "Akra Vassiliki", while the southern end is called "Akra Roussa". Between the above on the eastern side of the island a gulf is formed, where  is the bay Vasiliki. On the west coast is the bay of Pserimos, in which there is the homonymous village. About 2 miles north of Pserimos Bay is the northwestern tip of the island called Akra Koraki (or Akrotiri Koraki), from which the rocky islet of Plati or Platy is located 6 steps southwest.
The island is mountainous, with low vegetation, and small valleys with abundant olive trees, while it is full of native capers, for which it was famous since antiquity. The island is barren and the inhabitants are engaged in animal husbandry and olive growing. Pserimos has a fishing shelter.
The climate of the island is Mediterranean, with mild winters and cool summers.
The inhabitants of the island are engaged in fishing, olive cultivation and animal husbandry.