Bhutan is a mountainous country of extremely high altitudes and irregular, often precipitous terrain, which may vary in elevation by several thousand feet within a short distance. Elevation generally increases from south to north. The mountains are a series of parallel north-south ranges. The loftiest peaks, found in the Himalayan chain that stretches along the northern border, include Kula Kangri (7,554 m/24,783 ft) and Chomo Lhari (7,314 m/23,997 ft). Great spurs extend south from the main chain along the eastern and western borders. In the rest of the country are mainly ranges of steep hills separated by narrow valleys. Bhutan is drained by many rivers flowing south between these ranges and for the most part ultimately emptying into the Brahmaputra River in India.