That bright white spot you see (about half a centimeter long with the distinct arch) about one fifth the length from right edge of the picture and one fifth the height from the bottom edge of the picture – that is Hoover Dam! Check out the huge Lake Mead it has created by stopping that water. When full, that is the largest reservoir in the USA. River Colorado runs thru it. And right in the middle of it is the boundary of Nevada and Arizona.