The Ceahlău Massif (pronounced [t͡ʃe̞ahˈləw]) is one of the most notorious mountains of Romania. It is part of the Bistriţa Mountains range of the Eastern Carpathians division, in Neamţ County, in the Moldavia region. The two most important peaks are Toaca (1904 m altitude) and Ocolaşul Mare (1907 m altitude). It is bounded to the east by the Bistriţa River and Lake Bicaz, to the south by the Bicaz River.