The river originates at the confluence of the Phra Prong River and the Hanuman River near Kabin Buri, Prachinburi Province.
It empties after 231 kilometres into the Gulf of Thailand at the northeastern tip of the Bay of Bangkok.
The watershed of the Bang Pakong is about 17,000 square kilometres (6,600 sq mi).
To protect the Irrawaddy dolphins, fishermen on the Bang Pakong River have been persuaded by authorities to stop shrimping and 30 to 40 fishing boats have been modified so they can offer dolphin sightseeing tours.
Endangered sheatfish Ceratoglanis pachynema is endemic to the Bang Pakong.
Dvaravati settlements include Muang Phra Rot, Dong Si Maha Phot, Dong Lakhon, and Ban Khu Muang. Dvaravati coins have been found at U-Tapao.
