In 1939, Tilman was the first man to attempt climbing in the remote and unexplored Assam Himalaya, exploring the Southern approaches of Gori Chen, 6538 metres, before his team succumbed to malaria. In 1947 he attempted Rakaposhi, then made his way to Kashgar to join up with Eric Shipton in a lightweight attempt on Muztagh Ata, 7546 metres, which nearly succeeded. On his way back to India, he detoured through Afghanistan's Wakhan Corridor to see the source of the river Oxus. During his extensive exploration of the areas of Langtang, Ganesh and Manang in Nepal in 1949, Tilman was the first to ascend Paldor, 5896 metres, and found the pass named after him beyond Gangchempo.