San

The San is a river in southeastern Poland and western Ukraine that is a tributary of the Vistula and is one of the Longest Rivers in Poland. It has a length of 458 km and a basin area of 16,877 km2 (14,426 km2 of it in Poland). The San begins in the Carpathian Mountains in the settlement of Sianky, at a height of 900 meters, directly on the Polish-Ukrainian boundary and on the continental watershed, and forms the border between Poland and Ukraine for about 50 kilometers. Lake Solina, Poland's largest artificial lake, was formed by a dam on the San River near Lesko.

As early as the 9th or 10th century, the San valley must have become an important trading route and center of human habitation. [Citation required] Following that, the territory became a part of the Great Moravian state. The Lendians of the area proclaimed their allegiance to the Hungarian Empire following the invasion of Hungarian tribes into the heart of the Great Moravian Empire in 899. Starting about the 9th century, the territory became a source of rivalry between Poland, Kievan Rus, and Hungary. This territory was first documented in 981 (by Nestor) when Volodymyr the Great of Kievan Rus took it over on his route into Poland. It was restored to Poland in 1018, lost to Rus in 1031, and was reclaimed by Casimir III of Poland in 1340.

Total Length: 275 miles