Otwock is a town in east-central Poland, some 23 kilometres southeast of Warsaw, with 44,635 inhabitants. Otwock is a part of the Warsaw Agglomeration. It is situated on the right bank of Vistula River below the mouth of Swider River. Otwock is home to a unique architectural style called Swidermajer.
Otwock is situated in the Masovian Voivodship since 1999; previously, it was in Warszawa Voivodship. It is the capital of Otwock County. The town covers the area of 47 square kilometres. Forested areas make up 23% of the territory.