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Geography

Coral reefs are submerged structures consisting of calcium carbonate secreted by corals.

Mudflats, or otherwise known as tidal flats, are coastal wetlands that form when mud is left behind by tides or rivers.

A salt marsh, also otherwise known as a coastal salt marsh or a tidal marsh, is a coastal ecosystem in the upper coastal intertidal zone that lies between the land and the open salt water or brackish water that is routinely flooded by the tides.

The Hajar Mountains, which is Arabic for stone mountains, is located in northeastern Oman and the eastern United Arab Emirates are the highest mountain range within the eastern Arabian Peninsula.

The Amsterdam and Saint-Paul Islands temperate grasslands is an ecoregion including two volcanic islands in the southern Indian Ocean.

Tristan da Cunha is an archipelago of five islands within the southern Atlantic Ocean, the biggest of which is the island of Tristan da Cunha itself and the second-biggest, the isolated bird haven Gough Island.

The Great Basin shrub steppe ecoregion, located within the Deserts and xeric shrublands Biome, incorporates a variety of xeric shrub-steppe sub-ecoregions in the area of the Great Basin in the Western United States.

The Mulga Lands are an interim Australian bioregion out of eastern Australia made up of dry and sandy plains that are scattered with mulga trees.

The Edwards Plateau is an area of west-central Texas which is bordered by the Balcones Fault towards the south and the east, the Llano Uplift and the Llano Estacado towards the north, and the Chihuahuan Desert and Pecos River towards the west.

Rainforests are forests that are characterized by high levels of rainfall, with definitions based on a minimum usual annual rainfall of about 68 to 78 inches.

Kelp forests are areas that are underwater with a high density of kelp.

Taiga, or otherwise known as boreal forest, is a biome that is characterized by coniferous forests made up mostly of spruces, larches, and pines.

A wetland is an area of land that is saturated with water, either permanently or seasonally, such that it takes on the traits of a distinct ecosystem.

The Central tall grasslands are a prairie ecoregion of the Midwestern United States, a portion of the North American Great Plains.

The Central forest-grasslands transition are a prairie ecoregion of the central United States, a portion of the North American Great Plains.

The Central and Southern mixed grasslands are a prairie ecoregion of the central United States, a portion of the North American Great Plains.

The Columbia Plateau ecoregion is a Level III ecoregion designed by the United States Environmental Protection Agency in the U.S. states of Oregon and Washington, with little areas over the Washington state border in Idaho.

The Flint Hills, known historically as Bluestern Pastures or Blue Stem Hills, are a group of hills located in eastern Kansas reaching into north central Oklahoma, extending from Marshall County and Washington County in Kansas in the north to Cowley Cou...

The Montana Valley and Foothill grasslands are an ecoregion of northwestern North America within the northern United States and Canada.

The Sandhills, frequently written as Sand Hills, is a region of mixed-grass prairie on grass-stabilized sand dunes within north-central Nebraska, covering just over a quarter of the state.