ND is north of the Mojave Desert. Also next to Death Valley, so pretty much desert.
The regions aren’t really rectangular. They have specific boundaries, but we didn’t draw those out for SOTAmaps.
Overlapping regions…the original W6 ARM was a manual “best of” selection, with reasonable regions. When we revisited that with software finding summits, some of the original regions had more than 999 summits, which didn’t fit the SOTA designator. So we had to make new regions. The new ones try to follow geographic and political areas.
In the ARM, the Northern Desert region boundaries are described as: “This region was created in version 2 of this document and overlays the northern portion of the Desert Ranges region but excludes the White Mountains and Inyo Mountains. Its southern border with the Southern Desert region (W6/SD) is formed by Interstate 15.” Obviously, not well represented by a rectangle.
The overlap is also annoying where I live, in the San Francisco Bay area.
One solution would be to make new designators for all of the original summits and stop using those regions. That might be more bother than it is worth.