During his prime ministership, the Gurkha empire had already reached its greatest expanse from Sutlej river in the west to the Teesta river in the east.
The entire watershed is the most fertile agricultural zone along with the Teesta Basin.
Jalpaiguri lies in the middle of the vast fertile plains(Terai)south of the Himalayas,watered by innumerable rivers and rivulets rising from and flowing down the Himalayas.On a clear sunny day,Mount Kanchenjunga is visible from the city itself.The city lies on the banks of the Teesta river which is the second largest river in West Bengal after the Ganges.
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Other than the Teesta, the Karala river, nicknamed the "Thames of Jalpaiguri", flows through the city thereby bisecting it into two halves.
The land mark red brick main building is located on the bank of River Teesta.
The combined stream, known as Ranikhola, drains into Teesta at Singtam.
Teesta Setalvad—a human and social rights worker based in Bombay
When the cops begin to investigate, they find that Teesta had a roommate Sonali (Jasmine) and that Sonali is engaged to a prominent businessman, K.K. Menon (Sanjay Singh).
Veined by mighty rivers like the Teesta, Torsa, Jaldhaka, Raidak, Dyna, Neora, Sankosh etc. this piece of land has been aptly named as the land of 'Tea, Timber and Tourism'.
Eventually after the establishment of Namgyal dynasty in Sikkim and under the Lho-Mehn-Tsong Tsum, a treaty between the Bhutia, Lepcha and Limbu people of the Sikkim area, Limbuwan lost the area between Kunchenjunga range (present day eastern border of Nepal) and Teesta River to the Bhutia Kings of Sikkim.