Gopalganj is a town, municipality and headquarters of Gopalganj district in the Indian state of Bihar. Gopalganj Town occupies an area of 11.11 square kilometres. It is located at coordinates 26°28′N 84°26′E / 26.47°N 84.43°E Latitude and longitude. It has an average elevation of 66 metres. Gandaki River, which often causes flooding, flows southwards.