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The Lhagba Pool was a high altitude lake considered to exist, but an examination of evidence, including satellite photos leads to a conclusion that it has dried out. It was considered the highest lake in Tibet and the second highest lake in the world, behind 
Ojos del Salado
Nevado Ojos del Salado is a dormant complex volcano in the Andes on the Argentina–Chile border. It is the highest volcano on Earth and the highest peak in Chile. The upper reaches of Ojos del Salado consist of several overlapping lava domes, l ...
's crater lake
Crater Lake (Klamath: ''Giiwas'') is a volcanic crater lake in south-central Oregon in the western United States. It is the main feature of Crater Lake National Park and is famous for its deep blue color and water clarity. The lake partly fills ...
. The Pool was supposed to lie at an elevation of above sea level. It is located between East Rongbuk Glacier and Lhagba La, around north of the Everest summit and east. It has not been a major attraction, but is said to be a surprisingly width and length lake with 50m and 180m respectively.
References
Lakes of Tibet {{Tibet-stub