Ratchaburi Province is a medium-sized province with an area of about . The eastern part of the province contains the flat river plains of the Mae Klong, crisscrossed by many khlongs. The most famous tourist spot in this area is the Damnoen Saduak Floating Market. The west of the province is more mountainous, and includes the Tenasserim Hills. As the mountains are made mostly of limestone, there are several caves containing stalactites. Some caves are inhabited by large colonies of bats, and it is an impressive sight when they swarm out in the evening to feed. Other caves like the Khao Bin are accessible for visitors.