evidence: The border with China runs 3488 km. It can be divided into three sectors: Western Sector: This includes the border between Jammu and Kashmir and Xinjiang and Tibet. India claims that China is occupying 43,000 sq km in this sector, including 5180 sq km illegally ceded to it by Pakistan. Central Sector: This includes borders shared by Himachal Pradesh and Uttrakhand with Tibet. Shipki La and Kaurik areas in HP and areas around Pulam, Thag La, Barahoti, Kungri Bingri La, Lapthal and Sangha are disputed. Eastern Sector: China disputes India's sovereignty over 90,000 sq km, mostly in Arunachal Pradesh. Tawang, Bum La, Asaphi La and Lo La are among the sensitive points in this sector. Strategically vital Tawang holds the key to the defence of the entire sub-Himalayan space in this sector.Jawaharlal Nehru with Chinese premier Zhou Enlai