四川盆地
Transportation to the west from Sichuan has proven to be an even greater challenge, with steep mountains and deep valleys hindering movement. Nevertheless, the Sichuan Basin has played a role as a stopover on the southern Silk Road and provided the most direct route between India and China. The southern trade route to Tibet also passed through the basin, eventually crossing Kham and the Derge Kingdom to the west. The Long March passed to the west of Sichuan Basin in 1935 with great difficulty.