Dao Khanong Canal is connected to the lower reach of the Chao Phraya river. The point where polluted water from a canal is flowing into the Chao Phraya river becomes a significant pollution source of Chao Phraya. Many canals in Bangkok and especially in Samut Prakan have turned into a dumping ground for discharge wastewater from factories in the areas. This canal is one of the famous canals for tourist sightseeing because of the temples, local houses, restaurants, snake farms, and fruit farms.