The border at Galwan River was first enunciated by China in a map published in 1956, and endorsed by Zhou Enlai in 1959. In that, China claimed a boundary that started east of the Karakoram Pass and ran south-east, cutting through the Galwan River valley to Khurnak Fort. From there it ran south through the centre of the Pangong Lake, passing through the eastern extremity of the Spanggur Lake and then, further south to Demchok.
In 1960, when Zhou Enlai led an official delegation for talks to New Delhi, China advanced a new border that claimed an additional 5,180 sq. km of Indian territory in Ladakh.