Oia is a former community on the islands of Thira and Therasia, in the Cyclades, Greece. Since the 2011 local government reform it is part of the municipality Santorini, of which it is a municipal unit. It covers the whole island Therasia and the northwesternmost part of Santorini, which it shares with the municipal unit of Santorini. The population was 1,230 inhabitants at the 2001 census, and the land area is 19.449 km.
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