Khlong Saen Saeb (in Thai: คลองแสนแสบ, also known as Saen Saep) is a canal (Khlong) in central Thailand, connecting the Chao Phraya River to Prachin Buri and Chachoengsao. A portion of the canal is used for public transport by an express boat service in Bangkok. The canal is lined with concrete walkways on either side in many areas where people stroll despite the foul smells of the canal, and in other areas the heavily polluted water oozes into adjacent properties, especially after heavy rainstorms.