The definition of wetlands given by the Convention on Wetland(The convention on the Wetland of International Importance especially as Waterfowl Habitat) on Wetland is as follows: Wetlands are areas of marsh, fen, peatland or water, whether natural or artificial, permanent or temporary with water that is static or flowing，fresh, brackish or salt，including areas of marine water the depth of which at low tide does not exceed six meters.

Wetlands include marshes, peatlands, meadows, lakes, rivers, floodplains, deltas, mudflats, coral reefs, mangroves, reservoirs, ponds and rice fields.