Sandomierz Basin (Polish: Kotlina Sandomierska) is a lowland, located in southeastern Poland, between the Lesser Poland Upland, Lublin Upland and the Western Carpathians. Its name comes from the historical city of Sandomierz, and the basin has a triangular shape with the size of around 15,000 km2 (5,800 sq mi). It is drained by the Vistula River, as well as its eastern tributary, the San (both rivers make its northern border). Among major cities located in the Sandomierz Basin are Dębica, Jarosław, Mielec, Przemyśl, Przeworsk, Rzeszów, Stalowa Wola, Sandomierz, Tarnobrzeg, and Tarnów.
Sandomierz Basin lies on the territory of three Polish provinces - Lesser Poland Voivodeship (northeastern corner), Podkarpacie Voivodeship) (southwestern corner), and Lublin Voivodeship (northwestern corner). It is densely inhabited, with the exception of the Niepolomice Forest and the Sandomierz Wilderness. The basin is divided into the following geographical subregions:
Sandomierz (pronounced: [sanˈdɔmʲɛʂ]) is a town in south-eastern Poland with 25,714 inhabitants (2006), situated in the Świętokrzyskie Voivodeship (since 1999). It is the capital of Sandomierz County (since 1999). Sandomierz is known for its Old Town, which is a major tourist attraction. In the past, Sandomierz used to be one of the most important urban centers not only of Lesser Poland, but also of the whole country.
The name of the city might have originated from the Old Polish Sędomir, composed of Sędzi- (from the verb sądzić "to judge") and mir ("peace"), or more likely from the antiquated given name Sędzimir, once popular in several Slavic languages. Sandomierz is known in German: Sandomir; Latin: Sandomiria; Yiddish: צויזמיר; Hungarian: Szandomir; Ukrainian: Сандомир or Судомир; Russian: Сандомир; and Czech: Sandoměř.
Sandomierz is one of the oldest and historically most significant cities in Poland. Archeological finds around the city indicate that humans have inhabited the area since neolithic times. The city came into existence in the early Middle Ages, taking advantage of an excellent location at the junction of Vistula and San rivers, and on the path of important trade routes. The first known historical mention of the city comes from the early 12th-century, when the chronicler Gallus Anonymus ranked it together with Kraków and Wrocław as one of the main cities of Poland. The testament (ca 1115-1118) of Bolesław III Wrymouth, in which he divided Poland among his sons, designated Sandomierz as the capital of one of the resulting principalities, the Duchy of Sandomierz.