Fort Nečven or Nečven City (also Nečvem or Nechwen as it was in 1487 AD) is a medieval Croatian fortress from the 14th century, and one of the most important fortified buildings in Croatia in terms of size and degree of preservation. It is on the west side of Promina, on the edge of the high cliffs of river Krka, 3 kilometres (2 mi) south of Miljacka falls, where the Krka National Park begins, by the eponymous village.