evidence: The site of the clash was on the de facto border - the Line of Actual Control or LAC - between the two countries. India and China share a border that is more than 3,440km (2,100 miles) long and have overlapping territorial claims. The Galwan river valley, with its harsh climate and high altitude terrain, lies along the western sector of the LAC and close to Aksai Chin, a disputed area claimed by India but controlled by China. [...] In May, media reports said Chinese forces had put up tents, dug trenches and moved heavy equipment several kilometres inside what had been regarded by India as its territory.