The water in the region where the Mojave, Sonora, and Great Basin deserts converge originates from local rainfall at lower elevations. This is contrary to the earlier belief that rainwater was not a significant source of surface water. The scientist's study revealed that most of the water in the area comes from rainwater.
The water seeps through cracks and spaces between rock particles, eventually reaching aquifers. Aquifers are underground areas made of porous rock that act as reservoirs for the water. These aquifers carry the water and allow it to flow to the large and small springs in the region.
In summary, the water in the region originates from local rainfall at lower elevations and is transported through aquifers, ultimately reaching the surface through springs.