Table 3.

The list of the traveling time spent by past travelers of the plateau.

Figure and event	Place of departure	Place of arrival	Traveling route	Travel time (days)	Simulated time (days)	References
Ma hetian investigates in Yushu	Xining	Yushu	Tang-Tibet ancient road	41	40.6	43
Missionary, Jean Grueber, into Tibet	Xining	Lhasa	Xining-Qaidam Basin-Lhasa	90	89.2	44
Missionary, Jean Grueber, out of Tibet	Lhasa	Nyalam	Not specified	30	23	44
Missionary, Francois Marley, into Tibet	Kathmandu	Lhasa	Passing through Nyalam -Dingri	60	34	44
Missionary, Dominic, into Tibet	Kathmandu	Lhasa	Passing through Nyalam	57	34	44
Missionary, Dominic, out of Tibet	Lhasa	Kathmandu	Passing through Nyalam	45	34	44
Missionary, Desideri, into Tibet	Leh	Lhasa	Passing through Qiangtang	223	96	44
Missionary, Desideri, into Tibet	Saga	Lhasa	Not specified	49	42	44
Missionary, Pedro Cabral, into Tibet	Bhutan	Shigatse	Not specified	33	12.5	44
The Northern route of Qing army's entering Tibet	Xining	Lhasa	Passing through the sources of the Yellow River and the Yangtze River	135	89.2	45
The northern route of Qing army's entering Tibet	Chengdu	Lhasa	Passing through Litang, Batang, Changdu	122	102	45

These events occurred in A.D. 1,620–1937, and each travel period was within 1 year.