The answer depends on what you mean by "region". If you mean physical region, they are in the Interior Plains region and the Great Plains subsection. If you mean cultural region, they were within the North American Plains people region. -BookShark
The Black Hills of South Dakota are located in the Great Plains Region of the United States.
The Black Hills.
This sounds like the Black Hills of South Dakota.
They are from The Black Hills, an area near Mount. Rushmore and between South Dakota and Wyoming.
The Black Hills are located in western South Dakota and eastern Wyoming. Harney Peak is the highest summit in the Black Hills. Mount Rushmore National Memorial and Crazy Horse Memorial are both located in the Black Hills.
The Black Hills are located in western South Dakota, and extend into eastern Wyoming, USA.
The Black Hills are a mountain range that has been eroded for millions of years and has the appearance of rolling hills with granite summits throughout. The entire region is covered by Ponderosa pine, and the dark green pine needles appear black from a distance.
The Black Hills (Khe Sapa) of South Dakota and Wyoming are sacred to the Oceti Sakowin (The Great Sioux Nation), mainly the Tetonwan/Teton (Lakota).
North and South Dakota. The Dakotas region of the United States, in the Black Hills.
South Dakota is divided into three regions, one of which is the Black Hills, located in western South Dakota.
If you are using Black Hills as the name of a place, then yes, it should be capitalized because it would be a proper noun. i.e. Black Hills of South Dakota. If it isn't being used as a particular place, i.e. Look on top of those black hills which are next to that white mountain, then it would not be capitalized.
The Black Hills are primarily composed of igneous rock known as phonolite and syenite. These rocks are remnants of ancient volcanic activity, but the Black Hills themselves are not volcanoes. The volcanic activity that produced these rocks occurred around 70-80 million years ago.