It is considered to be the biggest man-made tank of Bangladesh. It bears some outstanding historic events of national heritage. The tank was named after Raja Ram Nath who excavated it on the eve of the battle of palashi. The National Park is extended over 69.16 acres of land and it was excavated to supply drinking water to the people living in the surrounding villages.

There was a ghat (stairs) on the middle part of the western bank and the remains of it still exist. Made of sandstone slabs of different sizes, the structure measured about 45.8m by 18.3m. The tank is surrounded by 10.75m high embankments.

Ramsagar is now a famous tourist spot. In addition to Forest Department’s initiatives Parjatan Corporation has developed some infrastructures for the beautification of the area. In winter huge number of migratory birds visit this lake which is a source of recreation of visitors.