Answer
The Gurkha Empire was a powerful Himalayan kingdom that existed from the 18th to the 19th centuries. During the prime ministership of Bhimsen Thapa, the empire expanded to its greatest extent, reaching from the Sutlej River in the west to the Teesta River in the east. This expansion was made possible by Thapa's military prowess and his ability to forge alliances with other Himalayan kingdoms.