Labrador is the easternmost part of the Canadian Shield and is composed of ancient Precambrian igneous and metamorphic rocks. The interior averages about above sea level and is cut by large, east-flowing rivers, such as the Churchill River and its tributaries. The northern coast is largely mountainous. The Torngat Mountains, Kaumajet Mountains and Kiglapait Mountains dominate this area with the highest peak being Mount Caubvick at . Torngat Mountains National Park Reserve was created in 2005 to preserve part of this area.