The summit itself is on the border. According to the China-Nepal
border treaty of 1961:
"11--From Niehlu (Niule) bridge the boundary line runs generally
eastward to Chejenma (Guari Smankar), and then eastward along the
mountain ridge and then northward along the watershed between the
Rongshar River and the Rongbuk River on the one hand and the
tributaries of the Dudh Kosi River on the other hand to Nagpa Pass,
and then runs generally southeastward along the mountain ridge,
passing through Cho Oyu Mountain, Pumoli Mountain (Gnire Langur),
mount Chomo-lungma (Sagarmatha) and Lhotse, to Makalu Mountain; then
runs southeastward and then eastward along the mountain ridge to Popti
Sagarmartha is Mount Everest. It's not uncommon for borders to run
along watershed boundaries, and, therefore, bisect mountain peaks.
So your question, therefore, only pertains to someone who would ascend
the north side of Everest and descend the south side. I've been
searching for 45 minutes and haven't found any evidence of an
expedition that did that. Typically, climbers travel to Kathmandu,
then cross over to China at Zhangmu if they are going to climb the
north side. They clear customs at Zhangmu.
However, a Chinese expedition planned for 2008 is to ascend from the
south and descend on the north side, carrying the torce for the
Beijing Olympics. We'll see how they clear customs!
(Also, an American expedition planned for this spring intends to
follow a route that will start on the south side then hook around to
I hope this answer meets your needs. If not, please request clarification.
Sources: U.S. State Department, "China-Nepal Boundary," 30 May 1965,
"Spring/Fall 2005 Expeditions," 8 Feb. 2005,
Dave Hahn, "From Nepal to Tibet," Mountain Zone Everest '98,
"Four Against Everest," 6 Oct. 2004,
Eric Simonson, "Border Crossing from Nepal to Tibet," Mountain Zone,
23 March 1999, http://classic.mountainzone.com/everest/99/north/disp3-23simo.html.
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