Strzelin is a town in Lower Silesian Voivodeship in south-western Poland. It is located on the Oława river, a tributary of the Oder, about 39 kilometres south of the region's capital Wrocław. It is part of the Wrocław metropolitan area. The town is the seat of Strzelin County and also of the smaller municipality of Strzelin. It is known for its extensive granite quarries, and contains Europe's deepest granite quarry. It is 123 meters deep and covers 19.5 ha