Geography thumb|First map of Silesia by Martin Helwig, 1561; north at the bottom Most of Silesia is relatively flat, although its southern border is generally mountainous. It is primarily located in a swath running along both banks of the upper and middle Oder (Odra) River, but it extends eastwards to the upper Vistula River. The region also includes many tributaries of the Oder, including the Bóbr (and its tributary the Kwisa), the Barycz and the Nysa Kłodzka. The Sudeten Mountains run along most of the southern edge of the region, though at its south-eastern extreme it reaches the Silesian Beskids and Moravian-Silesian Beskids, which belong to the Carpathian Mountains range.
Geography thumb|First map of Silesia by Martin Helwig 1561; north at the bottom Most of Silesia is relatively flat although its southern border is generally mountainous It is primarily located in a swath running along both banks of the upper and middle Oder (Odra) River but it extends eastwards to the upper Vistula River The region also includes many tributaries of the Oder including the Bóbr (and its tributary the Kwisa) the Barycz and the Nysa Kłodzka The Sudeten Mountains run along most of the southern edge of the region though at its south-eastern extreme it reaches the Silesian Beskids and Moravian-Silesian Beskids which belong to the Carpathian Mountains range