城門河
The water quality of Shing Mun River has improved from bad to good in terms of the Water Quality Index since 1993. Lifeforms including fish and invertebrates have also reappeared in the river. In 2001, bioremediation and dredging works began to further improve the river environment. Levels of odour-causing sulphides and E. coli subsequently dropped sharply. But the water quality is still threatened by the polluted condition of Tolo Harbour, which backflows into the Shing Mun River during high tide, causing contamination.