Trostianets (also Trostyanets; Ukrainian: Тростянець) is a city in Sumy Oblast, Trostianets Raion, Ukraine. It is located on the Boromlya River, 59 km (37 mi) from Sumy. The city population is 23,300 (2001). The district of Trostyanets has 49 settlements, inhabited by 41,700 people governed by 16 village councils and the town. Local sights include a neo-Gothic "round courtyard" (1749), the late Baroque church of the Annunciation (1744–50), the 18th-century Galitzine palace, and a "grotto of nymphs" (an 1809 centenary memorial to the Battle of Poltava).