The Pran Buri dam was built in 1978, to protect the lowland against flooding and well as to have a steady waterflow for irrigation use. The 42 m high and 1500 m wide earthen dam creates an artificial lake, which covers an area of 35.2 km² and has a capacity of 445 million m³.
At the estuary of the river to the Gulf of Thailand is the Pran Buri Forest Park, covering 3.17 km² of mixed forest and mangrove forest. It was created in 1982.