According to the Ramsar Convention on Wetlands; “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 metres."
The Ramsar convention on Wetlands identifies the following wetland types:
A -- Permanent shallow marine waters in most cases less than six metres deep at low tide; includes sea bays and straits.
B -- Marine subtidal aquatic beds; includes kelp beds, sea-grass beds, tropical marine meadows.
C -- Coral reefs.
D -- Rocky marine shores; includes rocky offshore islands, sea cliffs.
E -- Sand, shingle or pebble shores; includes sand bars, spits and sandy islets; includes dune systems and humid dune slacks.
F -- Estuarine waters; permanent water of estuaries and estuarine systems of deltas.
G -- Intertidal mud, sand or salt flats.
H -- Intertidal marshes; includes salt marshes, salt meadows, saltings, raised salt marshes; includes tidal brackish and freshwater marshes.
I -- Intertidal forested wetlands; includes mangrove swamps, nipah swamps and tidal freshwater swamp forests.
J -- Coastal brackish/saline lagoons; brackish to saline lagoons with at least one relatively narrow connection to the sea.
K -- Coastal freshwater lagoons; includes freshwater delta lagoons.
Zk(a) – Karst and other subterranean hydrological systems, marine/coastal
L -- Permanent inland deltas.
M -- Permanent rivers/streams/creeks; includes waterfalls.
N -- Seasonal/intermittent/irregular rivers/streams/creeks.
O -- Permanent freshwater lakes (over 8 ha); includes large oxbow lakes.
P -- Seasonal/intermittent freshwater lakes (over 8 ha); includes floodplain lakes.
Q -- Permanent saline/brackish/alkaline lakes.
R -- Seasonal/intermittent saline/brackish/alkaline lakes and flats.
Sp -- Permanent saline/brackish/alkaline marshes/pools.
Ss -- Seasonal/intermittent saline/brackish/alkaline marshes/pools.
Tp -- Permanent freshwater marshes/pools; ponds (below 8 ha), marshes and swamps on inorganic soils; with emergent vegetation water-logged for at least most of the growing season.
Ts -- Seasonal/intermittent freshwater marshes/pools on inorganic soils; includes sloughs, potholes, seasonally flooded meadows, sedge marshes.
U -- Non-forested peatlands; includes shrub or open bogs, swamps, fens.
Va -- Alpine wetlands; includes alpine meadows, temporary waters from snowmelt.
Vt -- Tundra wetlands; includes tundra pools, temporary waters from snowmelt.
W -- Shrub-dominated wetlands; shrub swamps, shrub-dominated freshwater marshes, shrub carr, alder thicket on inorganic soils.
Xf -- Freshwater, tree-dominated wetlands; includes freshwater swamp forests, seasonally flooded forests, wooded swamps on inorganic soils.
Xp -- Forested peatlands; peatswamp forests.
Y -- Freshwater springs; oases.
Zg -- Geothermal wetlands
Zk(b) – Karst and other subterranean hydrological systems, inland
1 -- Aquaculture (e.g., fish/shrimp) ponds
2 -- Ponds; includes farm ponds, stock ponds, small tanks; (generally below 8 ha).
3 -- Irrigated land; includes irrigation channels and rice fields.
4 -- Seasonally flooded agricultural land (including intensively managed or grazed wet meadow or pasture).
5 -- Salt exploitation sites; salt pans, salines, etc.
6 -- Water storage areas; reservoirs/barrages/dams/impoundments (generally over 8 ha).
7 -- Excavations; gravel/brick/clay pits; borrow pits, mining pools.
8 -- Wastewater treatment areas; sewage farms, settling ponds, oxidation basins, etc.
9 -- Canals and drainage channels, ditches.
Zk(c) – Karst and other subterranean hydrological systems, human-made