Which region is named for a major landform

Many regions are named for major land forms. A few examples include:

The Great Lakes

The Great Plains

The Great Basin

Provence-Alpes-Côte d'Azur (roughly translated as "Region of the Alps near the [sea] coast")

Appalachia

Yucatán Peninsula

Gulf Coast

Hawke's Bay

Ohio Valley

Kilimanjaro Region

Foothills of the San Gabriel Valley

I don’t know this one