In March 1963, Pakistan and China signed a boundary agreement delimiting their frontier in the Karakoram region, under which Pakistan ceded the Shaksgam Valley (Trans-Karakoram Tract) to China while China relinquished other territorial claims further south. The agreement, reached while Kashmir's final status remained (and remains) unresolved between India and Pakistan, was never recognized by India. Cited figures for the area involved vary by source, from roughly 1,900 km² (net Pakistani concession after Chinese counter-concessions) to about 5,300 km² (the gross area some Indian sources attribute to the cession). The area remains sparsely inhabited high mountain terrain near K2.
Pakistan and China signed a bilateral boundary agreement under which Pakistan ceded the Shaksgam Valley (Trans-Karakoram Tract), part of the disputed former princely state of Jammu and Kashmir, to China
No meaningful denominator exists. The tract, roughly 5,180 square kilometres of glaciated high terrain on the northern slope of the Karakoram, has no settled population and never has; it is used only for occasional summer grazing and mountaineering access. The agreement transferred territory and a boundary claim, not people. India has never recognised the cession, holding that Pakistan had no title to give.
The 1963 Sino-Pakistan boundary agreement was a negotiated bilateral instrument covering a largely uninhabited high-altitude area; no source documents deaths arising from it. India rejects the agreement's validity on the ground that the territory forms part of the disputed former princely state of Jammu and Kashmir, and both Pakistan and China treat the arrangement as provisional pending a Kashmir settlement, but the dispute has produced no casualties in the Shaksgam Valley itself.
China