I assume you mean Washington state, and not D.C.
The main land regions are the Coastal Range, Puget Sound Lowlands, Cascade Range, Rocky Mountains, and the Columbia Plateau.
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In the State of Washington there are 6 land regions
4 main land regions
Washington has 5 mainland regions. Coastal Region, Puget Sound Lowlands, Cascade Mountains, Okanogan Highlands, Columbia Plateau.
Vermont has six (6) main land regions.
There are 12 land regions in the state of Maine. The 4 main regions are, Somerset County Region, Androscoggin Region, York County Region, and Washington County Region.
2 main land regions
three main land regions
There are 4 main land regions.
yes they are considered land regions but not main ones
about 4 or 5 5 main land regions
there are 5 land regions in Connecticut.