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The Texas Blackland Prairies ecoregion covers an area of 50,300 km 2 (19,400 sq mi), consisting of a main belt of 43,000 km 2 (17,000 sq mi) and two islands of tallgrass prairie grasslands southeast of the main Blackland Prairie belt; both the main belt and the islands extend northeast–southwest.
The maps have county borders but no names; however, they detail rivers, lakes, and major cities, and contain photographs. There is also a Texas ecoregion report PDF which describes Cross Timbers vegetation and other features in much more detail than the maps. Under "Oklahoma," there is no ecoregion report PDF yet but more details are contained ...
In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology , physiography , vegetation , climate , soils , land use , wildlife distributions, and hydrology .
The small, disjunct areas of this ecoregion have a blend of characteristics from the Texas blackland prairies and the East Central Texas forests. The northern two outliers, north of the Sulphur River, occur on Cretaceous sediments, while south of the river, Paleocene and Eocene formations predominate. A mosaic of forest and prairie occurred ...
From its source near Frisco, Texas at , this creek runs south-by-south-east through suburban Dallas for 23.5 miles (37.8 km) where it widens into White Rock Lake, then continues south for another 8 miles (13 km) to its mouth on the East Fork of the Trinity River, of which it is a major tributary
Ecoregions of North America, featuring the 50 United States, the District of Columbia and the five inhabited territories. The following is a list of ecoregions in the United States as identified by the World Wide Fund for Nature (WWF).
Annual precipitation is 48 to 54 inches (120 to 140 cm) in Texas and up to 60 inches (150 cm) in Louisiana. There are many rivers, lakes, bayous, tidal channels, and canals. The streams and rivers that supply nutrients and sediments to this region are primarily from the humid pine belt of the South Central Plains (ecoregion 35).
Black Belt is a physical geography term referring to a roughly crescent-shaped geological formation of dark fertile soil in the Southern United States. It is about 300 miles (480 km) long and up to 25 miles (40 km) wide in c. east–west orientation, mostly in central Alabama and northeast Mississippi .