evidence: The reason for that decision lay in a new territorial claim by China. As Foreign Policy detailed in Part 1 of this investigation, the Namgung La marks the traditional border between Tibet and Bhutan. Thirty years after China annexed Tibet in the 1950s, Beijing changed its view of that border and declared that a 232-square-mile area of northern Bhutan, lying to the south of the Namgung La, had once belonged to Tibet and therefore was now part of China. That area was the Beyul Khenpajong, a remote and uninhabited region, famous throughout the Himalayas as a "hidden valley," that is exceptionally sacred to the Bhutanese. [...] China claims four areas in the west of Bhutan, three in the north, and Sakteng in the east. Since 1990, China has been offering to give up approximately 191 square miles of its claims in the north if Bhutan yields some 104 square miles of its territory in the west to China. Bhutan relinquished its claim to the Kula Khari area (often written as Kulha Kangri) in the 1980s or soon after, attributing its earlier claim to a cartographic error.