Much of southern Arizona lies in the Sonoran Desert. There's hardly any surface water, but the warm climate attracts a growing population, and the region's cities have ballooned. Here, you can see suburbs of Tucson sprawl to the foot of the Catalina Mountains; intense watering keeps the golf courses green. How is this sustainable?

There are 350 species of birds, 20 amphibians and 100 reptile species which shows the biological diversity of this region.

Explanation:

Sonoran desert is located on the border between the USA and Mexico and is the hottest desert in Mexico and has an area of 260,000 km sq. The largest city in the desert is a phoenix, the desert has various parks and conservation areas that facilitate the wildlife and are made for research purposes.  Most of the plants of this area have evolved specialized mechanisms, to adapt to the climate of the region.

East european plain and russian russkaya ravina.