 Osek is located approximately 8 km east of the city of Teplice and approximately 15 km from the Czech–German border.Its population is around 4,800 inhabitants.Osek is notable for a Burgundian Gothic monastery, originally built as the three-nave "Church of the Assumption of Our Lady" between 1207–1220 in the style of a Roman Basilica, by Cistercian monks who first arrived in Osek in 1199.