The island of Antiparos is located 0.8 nautical mi (1.5 km) southwest of Paros, separated by the Strait of Antiparos, known as Amfigeio. It lies 8 kilometres (5.0 miles) from the port of Parikia from which the passenger ferry runs.

The maximum length of the island is 11 kilometres (6.8 miles) from north to south, while the maximum width reaches 4.5 kilometres (2.8 miles). The total area is estimated at 37 to 38 km (23 to 24 mi). And the highest peak, St. Elias, in the middle of the island, is at 308 m.

The main town is called simply Antiparos. Antiparos is a volcanic rock and dry climate with high moisture, and morphology favors the development of strong winds. The flowers thrive in the region are mainly bougainvillea that adorn the gardens, houses and shops. The morphology of Antiparos is characterised essentially flat, with many small hilly peaks, while the vegetation of the island is low.

The island of Antiparos is surrounded by many small uninhabited islands with great historical and archaeological interest, such as Tsimintiri the Round, the Double, snow, Revmatonisi, the Red and Black Tourlos. Particularly well known in the international community is Despotiko, an uninhabited island west of Antiparos, where in recent years excavations of great archaeological importance have been carried out.