There are two types of wetland in Hong Kong: freshwater and brackish water.
Some farms pump water from underground to create a type of freshwater wetland, which is usually located in the flood plains. Long Valley , near Sheung Shui, which is also regarded as a cultural heritage site, is the largest freshwater wetland in Hong Kong. Long Valley is an agricultural area, where the main crops water spinach and watercress, attracts lots of pipits, wagtails, rails, warblers, Greater Painted Snipe, shrikes, and starlings
Brackish water wetlands are formed when streams flow into the sea, and an area of high salinity is formed around estuaries as the fresh water flow becomes slower and mixes with the salt water. This encourages the accumulation of sediment, which provides a rich substrate for the growth of mangroves and reeds. The Pearl River Delta lies to the NW of Hong Kong, thus we can find the largest brackish wetland in Hong Kongˇ¦s northwestern corner. About 15 sq km of the area belonging to the Mai Po Inner Deep Bay wetlands was designated as a Ramsar Site in September 1995. During winter, spring and autumn, tens of thousands of waterbirds, , and raptors utilize the wetland.
Examples of bird watching sites:
Freshwater wetlands including fishponds and farmland are also mostly found in the NW New Territories. During the winter, fishermen pump water out of the fishponds as a part of fishpond management. This concentrates trash fish in the small pools left behind, thus attracting large numbers of egrets to feed. Sometimes hundreds of egrets can be seen feeding around such ponds. The muddy bottom may also attract good numbers of waders. 
Mai Po Marshes Nature Reserve
Tsim Bei Tsui
Long Valley
Starling Inlet: Luk Keng and Nam Chung
Kam Tin
 |
 |
 |
 |
 |
| Urban area | Wetlands | Open country | Woodlands and Streams | Sea, coastal area and islands |
CLICK HERE for more bird watching sites