While Gangtok sits on a ridge, waterways are a vital part of its surrounding geography.
* **Teesta River:** The lifeline of Sikkim flows through the deep valleys below Gangtok, offering scenic beauty and adventure sports. * **Ranikhola:** A significant tributary of the Teesta that runs near the city. * **Waterfalls:** The region is dotted with cascades, including Bakthang Waterfalls and Banjhakri Falls, which serve as popular local attraction points. * **Tsomgo Lake (Changu Lake):** Located about 40 kilometers from Gangtok at an elevation of 3,753 meters, this glacial lake is deeply revered and forms a standard day-trip for visitors.
