Always best to search because some people will no doubt say "use the search function"
BUT. Expect a few airfields. Nellis and area 51 have been in screenshots. Square mileage, ummmm, big? But not crazy big. I was going to compare it to the Black Sea map, but its not exactly the same because the Black Sea map is more rectangular since you have the ocean as a limiting area, where as Nevada can be thought of more of a square. As far as cities, its Nevada, not California or Arizona :) the biggest one to expect would be Las Vegas.