Kazimierz Dolny is a small historic town in eastern Poland, on the right (eastern) bank of the Vistula river in Puławy County, Lublin Voivodeship. Historically it belongs to Lesser Poland, and in the past it was one of the most important cities of the province.

The Vistula is the longest river in Poland and the ninth-longest in Europe, at 1,047 kilometres in length. Its drainage basin, extending into three other countries apart from Poland, covers 193,960 km2 (74,890 sq mi), of which 168,868 km2 (65,200 sq mi) is in Poland.