The Chao Phraya is Thailand’s major river flowing 372 km from the confluence of the Ping and Nan rivers through Bangkok and into the Gulf of Thailand.
In Bangkok the Chap Phraya is a transport artery for a network of river buses, cross-river ferries, and water taxis. The river buses are cheap and are an excellent way for tourists to see Bangkok.
According to wikiyoyage the prices currently are around 30 Baht (roughly one US Dollar) and there are a confusingly large number of different boat lines:
The photograph was taken in November 2018.