Kolkata is located in the eastern part of India. It has spread linearly along the banks of Hooghly River. The Kolkata Municipal Corporation has an area of 205 square kilometres. The city is near sea level, with the average elevation being 17 feet. The whole area is in the Ganges Delta which starts within 100 km south to the city. Most of the city was originally marshy wetlands, remnants of which can still be found especially towards the eastern parts of the city.