Tsona City, formerly Tsona County, is a county-level city in Shannan Prefecture in the southeastern part of the Tibet region of China. Tsona means "The face of the [Nara Yumco] lake" in Tibetan. It lies immediately to the north of the McMahon Line agreed as the mutual border between British India and Tibet in 1914. China has not accepted the 1914 border delineation, but treats it as the Line of Actual Control (LAC). Tsona also borders Bhutan on its southwest.