Gopalganj-Khulna Beel occupies a number of low-lying areas between the Ganges Floodplain and the Ganges Tidal Floodplain. The major two beels of the area are Baghia Beel and Chanda Beel. Thick deposits of peat occupy perennially wet basins, but they are covered by clay around the edges and by calcareous silty sediments alongside ganges distributaries crossing the area. This is the largest peat basin of Bangladesh. The basins are deeply flooded by clear rainwater during the monsoon. In the basin close to khulna, the floodwater is somewhat brackish. Subsiding process is still active in this physiographic unit. [Jabed Kalim]