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Lhagba La or Lhakpa La (meaning "Windy Gap") is a col about northeast of 
Mount Everest
Mount Everest (), known locally as Sagarmatha in Nepal and Qomolangma in Tibet, is Earth's highest mountain above sea level. It lies in the Mahalangur Himal sub-range of the Himalayas and marks part of the China–Nepal border at it ...
in the Tibet Autonomous Region
The Tibet Autonomous Region (TAR), often shortened to Tibet in English or Xizang in Pinyin, Hanyu Pinyin, is an Autonomous regions of China, autonomous region of the China, People's Republic of China. It was established in 1965 to replace the ...
.
It was unknown to local inhabitants until it was discovered and named by the 1921 British Mount Everest reconnaissance expedition
The 1921 British Mount Everest reconnaissance expedition set off to explore how it might be possible to get to the vicinity of Mount Everest, to reconnoitre possible routes for ascending the mountain, and – if possible – make the first asce ...
when reconnoitring a route to climb the mountain.*
Lhagba La is the starting point of the Kharta Glacier which descends eastwards along the valley towards Kharta. The Kharta River is a tributary of the Arun River. On the western side of the col is the East Rongbuk Glacier which flows north from Everest. Lhagba Pool, below and less than southwest, was reportedly the second highest lake in the world, but the lake has likely dried up.
Expeditions attempting Everest via the North Col
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The North Col (; ) refers to the sharp-edged pass carved by glaciers in the ridge connecting Mount Everest and Changtse in Tibet. It forms the head of the East Rongbuk Glacier.
When climbers attempt to climb Everest via the North Rid ...
generally arrive up the East Rongbuk Glacier and so do not reach Lhagba La at all. However, when George Mallory
George Herbert Leigh-Mallory (18 June 1886 – 8 or 9 June 1924) was an English Mountaineering, mountaineer who participated in the first three British Mount Everest expeditions from the early to mid-1920s. He and climbing partner An ...
and Guy Bullock were trying to reach the North Col, the route from Rongbuk was unknown to them. Instead they approached from the east only to find the glacier did not extend to the North Col. The climbing team eventually had to cross the pass and descend some to the East Rongbuk Glacier before ascending to the North Col. Their discovery allowed the 1922 British Mount Everest expedition to take the more direct route from the north.
References
Mount Everest Mountain passes of the Himalayas Mountain passes of Tibet Mountain passes of China {{Shigatse-geo-stub