I believe it is the Columbia Plateau.
the most dry land region is columbia plateau
The driest land region is the Atacama Desert in South America. It receives nearly no precipitation in some areas, making it one of the most arid places on Earth.
The driest region in Victoria is the Mallee region
Mountains and Basins region(:
Yes, it is the driest region in mainland Southeast Asia.
Southwest
desert
The northeastern region, particularly in Bahia and Pernambuco.
The Mojave Desert is the driest region in the United States.
The region in Texas with the driest climate is typically the Trans-Pecos region in the western part of the state. This area experiences low rainfall and high temperatures, with desert-like conditions prevailing.
The Atacama Desert of Chile is the driest area in South America.
The west region has the wettest and driest place in the united states.