BOATS There are boat services along the Chao Phraya River between Nonthaburi Pier to the north of Bangkok to Wat Ratcha Singkhon Pier in southern Bangkok. (See Map of Bangkok on page 4-6.) The local line has no flag and fares range from 10-14 baht. The express boats are marked by a yellow flag, green flag or orange flag ; and the fares range from 13-32 baht, depending on the distance and types of boats. After disembarking at a main pier , you can cross the river using the ferry service if you need.