The Măcin Mountains (Romanian: Munții Măcin) is a mountain range in Tulcea County, Romania. Part of the Northern Dobruja Massif, they are located between Danube River to the north and west, Taița River and Culmea Niculițelului to the east and Casimcea Plateau to the south. Seen from the Danube, they seem only low hills. However, they are a mountainous region.
The Măcin Mountains are one of the oldest in Romania, being formed in the second part of the Paleozoic, in the Carboniferous and Permian, during the Hercynian orogeny. The predominant rock is granite. Erosion (caused by the difference of temperature) has created steep slopes, with the aspect of ruins.
