Wikipedia
Supraśl is a town in north-eastern Poland. It is the home of the Supraśl Lavra, one of six Eastern Orthodox monasteries for men in Poland. Supraśl is in Podlaskie Voivodeship (since 1999), previously in Białystok Voivodeship (1975-1998) (1975–1998), and is in Białystok County, about northeast of Białystok. It is the seat of the Gmina of Supraśl. Its population is 4,526 (2004).
The Codex of Supraśl, the oldest Slavic literary work in Poland and one of the oldest of its kind in the world, is named after the Supraśl Lavra. Since September 2007 it has been on Unesco's Memory of the World list.
Supraśl - is a river in east Poland in Podlaskie Voivodeship, a tributary of the Narew river (near Złotoria), with a length of 93,8 kilometres and the basin area of 1844,4 km
Supraśl is the source of the drinking water for Białystok.