Question: the glacier from which the river yamuna originates
Answer: Originating from the Yamunotri Glacier at a height of 6,387 metres on the south western slopes of Banderpooch peaks in the uppermost region of the Lower Himalaya in Uttarakhand , it travels a total length of 1,376 kilometres ( 855 mi ) and has a drainage system of 366,223 square kilometres ( 141,399 sq mi ) , 40.