Gliwice is a city in Upper Silesia, in southern Poland. The city is located in the Silesian Highlands, on the Kłodnica river. It lies approximately 25 km west from Katowice, the regional capital of the Silesian Voivodeship. Gliwice is the westernmost city of the Metropolis GZM, a conurbation of 2.0 million people, and is the third-largest city of this area, with 175,102 permanent residents as of 2021.