As a part of the 2011 Kallikratis government reform, the regional unit of Thira was created out of the former Cyclades Prefecture. It is subdivided into 5 municipalities. These are (number as in the map in the infobox):
The province of Thira (Greek: Επαρχία Θήρας) was one of the provinces of the Cyclades Prefecture. It had the same territory as the present regional unit. It was abolished in 2006.
Imerovigli (Greek: Ημεροβίγλι) is a village on the island of Santorini, Greece, adjacent to the north of the island capital Fira. Imerovigli is mostly famous for its beautiful sunset, that it is called "balcony to the Aegean". Its houses are built amphitheatrically around the caldera and it is crossed by narrow, paved paths.
Imerovigli has many lovely churches, all made in the Cycladic architectural style. They most notable are the church of Ai-Stratis, in the centre of the village, and the Monastery of Saint Nikolaos, on the way connecting Imerovigli to Fira. Another famous site of Imerovigli is Skaros, which are the remains of a Venetian Castle built in 1207 by Marco Sanudo, the ruler of all Cyclades islands that time.