Overview
Bhote Koshi in Nepal and Poiqu in Tibet, both names roughly mean "Tibetan river," is the name given to the upper course (main tributary) of the Sun Kosi river. It is part of the Koshi River system in Nepal.
Names and etymology
Bhotekoshi is the Nepalese name. In Nepali language, the word "bhoṭe" or "bhoṭiyā" means Tibetan; and the word "kosi" means river. As such the name is not unique, the western tributary of the upper Dudh Koshi is also called Bhote Koshi.
Poiqu is the common name for the river on the Chinese side. It is also transliterated as Boqu via Chinese. and as Po Chu by early 1990s Everest expeditions. This name means "River of Tibet." This is not a unique name, as it is also ascribed to Yarlung Tsangpo. The formal name of the river in Tibetan is Matsang Tsangpo.
River course
From Wikipedia (CC BY-SA 4.0).