Patmos is a Greek island in the Aegean Sea. It is famous as the location that John of Patmos received the visions found in the Book of Revelation of the New Testament, and where the book was written.
One of the northernmost islands of the Dodecanese complex, it has a population of 2,998 and an area of 34.05 km2. The highest point is Profitis Ilias, 269 metres above sea level. The municipality of Patmos, which includes the offshore islands of Arkoi, Marathos, and several uninhabited islets, has a total population of 3,047 and a combined land area of 45.039 square kilometres. It is part of the Kalymnos regional unit.
Wikipedia https://en.wikipedia.org/wiki/Patmos
Coordinates 37°19'51.185" N 26°33'28.074" E