Claim: Santorini is in a sea.

Therasia , also known as Thirasía , is an island in the volcanic island group of Santorini in the Greek Cyclades . It lies north-west of Nea Kameni , a small island formed in recent centuries by volcanic activity and thus marking the centre of the island group . Therasia is the second largest island of the group , the largest by far being Thera .   Therasia has a land area of 9.299 km ² and its population was 319 inhabitants at the 2011 census . It is part of the municipal unit of Oia .   Thera and Therasia were separated by the Thera eruption .   At Knossos , in a LMIIIA context -LRB- 14th century BC -RRB- , seven Linear B texts while calling upon `` all the gods '' make sure to grant primacy to an elsewhere-unattested entity called qe-ra-si-ja and , once , qe-ra-si-jo . However this probably refers to a god or a person rather than to an island * Qherasia > Therasia .   Thirasia is also the book of Greek poet Dimitris Varos that became a music album and theatrical performance by Greek composer Giannis Markopoulos under the title Daring Communication - Electric Theseus .