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).
Kalimnos é veciña da pequena illa de Telendos, que formaba parte de Kalimnos, pero logo dun gran terremoto no 554 AD dividiuse e agora están separadas por unha franxa de auga (aproximadamente 800 m de ancho).