Kalymnos is neighbored by the small island of Telendos, which was once part of Kalymnos, but split off after a major earthquake in 554 AD and is now separated from Kalymnos by a channel of water (about 800 m wide) [REF].
Between Kalymnos and Kos lies the islet of Pserimos which is inhabited and, with an area of , is one of the largest of the lesser islands of the Dodecanese.