evidence: The Trans-Karakoram Tract also known as Shaksgam or the Shaksgam Tract, is an area of more than 2,700 sq mi (6,993 km2) north of the Karakoram, including the Shaksgam valley and Raskam Yarkand river valley. The tract is now administered by China as part of its Xinjiang region. Although the area was not under Pakistan’s control since 1947, it was claimed by Pakistan as part of Kashmir until the 1963 Sino-Pakistan agreement in which Pakistan ceded the territory to China. It is claimed by India as part of the union territory of Ladakh. Most of the tract is composed of the Shaksgam Valley and was formerly administered as part of Shigar, a district in the Baltistan region. A polo ground in Shaksgam was built by the Amacha Royal family of Shigar, and the Rajas of Shigar used to invite the Amirs of Hotan to play polo there. Most of the names of the mountains, lakes, rivers and passes are in Balti/Ladakhi, suggesting that this land had been part of Baltistan/Ladakh region for a long time.