Korthio (Greek: Κόρθιο) is a former municipality on the island of Andros, in the Cyclades, Greece. Since the 2011 local government reform it is part of the municipality Andros, of which it is a municipal unit. Its population was 1,706 inhabitants at the 2021 census, and its land area is 81.918 km². It shares the island of Andros with the municipal units of Andros and Ydrousa.
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Andros (Greek: Άνδρος), also called Chora (Χώρα, "main town"), is a town and a former municipality on the island of Andros, in the Cyclades, Greece. Since the 2011 local government reform it is part of the municipality Andros, of which it is a municipal unit, and shares the island of Andros with the municipal units of Korthio and Ydrousa. The municipal unit has an area of 102.756 km. Its population was 3,918 inhabitants at the 2021 census.
It has a mixture of post-World War I neoclassical mansions with vernacular Cycladic houses. The town squares are paved with marble. At the end of the headland are two islands. The first, linked to the mainland by a brick bridge, with a ruined Venetian castle and the second with a lighthouse. There are four museums: the extensive Archaeological Museum, Museum of Modern Art, a Nautical Museum and a Folklore Museum.
Ydrousa (Greek: Υδρούσα) is a former municipality on the island of Andros, in the Cyclades, Greece. Since the 2011 local government reform it is part of the municipality Andros, of which it is a municipal unit. The population was 3,202 inhabitants at the 2021 census. It has a land area of 195.367 km and is the largest of the three municipal units on the island of Andros, covering over half of its territory. The seat of the municipality was in Gavrio. The municipal unit shares the island of Ándros with the municipal units of Andros (town) and Korthio.