The topography of Agartala is predominantly a low-lying, flat floodplain, distinguishing it from the hilly terrain that characterizes much of the rest of Northeast India. At an average elevation of just 12.8 meters (42 feet) above sea level, the city sits on a gentle plain.
While the city center is remarkably flat, the eastern fringes begin to feature gentle hillocks (tillas) and valleys (lungas). Because it lies in the flood plains of the Haora River and other smaller tributaries, the city is prone to waterlogging and seasonal flooding during heavy monsoon rains. There are no major mountains within the city limits, offering an uninterrupted, wide-open sky typical of deltaic plains.