Waterways and magnificent man-made water bodies define the geography and history of Sivasagar.
* **Rivers:** The city is flanked by the Dikhow River, a tributary of the mighty Brahmaputra, which has historically served as a vital transport and trade route. The Darika River also flows nearby. * **Historical Tanks:** The Ahom kings were masterful hydrologists. They excavated massive, perfectly rectangular artificial lakes that never dry up. The most famous are the **Sivasagar Tank**, **Joysagar Tank** (the largest man-made lake in India), and **Gaurisagar Tank**.
