Nepal's waterways are primarily glacier-fed and are critical for the region's agriculture, hydropower, and religious practices.
* **Major River Systems:** The Koshi (east), the Gandaki/Narayani (central), and the Karnali (west). The Bagmati River, which flows through the Kathmandu Valley, holds deep religious significance for Hindus. * **Lakes:** * *Phewa Lake:* Located in Pokhara, famous for reflecting Mount Machhapuchhre. * *Rara Lake:* Nepal's largest and deepest freshwater lake, located in the remote Mugu district. * *Tilicho Lake:* One of the highest lakes in the world, situated in the Annapurna range. * *Gokyo Lakes:* A stunning series of oligotrophic lakes in the Everest region. * **Waterfalls:** The monsoon season activates thousands of waterfalls across the hilly regions, with Rupse Falls in Mustang being a notable highlight.