Bangkok is actually built upon a marsh. Klongs or canals define reclaimed land. I took a water taxi through some neighborhoods. Everyone lives on the water. The Chao Phraya provides transportation. In addition to normal water taxis, an organized ferry system acts much like a subway with scheduled stops and even express boats. Boats run both upstream/downstream and across river.
Lodging–P&R Residence Hotel provides friendly, clean and secure lodging near the Sheraton and Chao Phraya River.