Marine - Ocean deeper than 50m
Coastal - Interface between ocean and land
Inland Water - Permanent water bodies and areas dominated by regular flooding that are inland from the coast
Forest - Land that is at least 40% covered by woody plants taller than 5m
Dryland - Land where annual precipitation is less than two thirds of potential evaporation
Mountains - Land surrounded by water and with a high proportion of coast to hinterland
Polar - High Latitude systems frozen for most of the year
Urban - Built environments with high human density and population of 5000 or more
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