The assemblage of high mountains ranges in southeastern Arizona is often referred to as the Sky Islands.¬†Rainfall increases and the temperature decreases the higher up you go. At the highest elevations, conditions are wet enough and cool enough¬†to support forests, making each isolated mountain range like a green island in a desert sea. These photographs were taken on the summit of Mt. Lemmon, the highest point in the Santa Catalina Mountains of Arizona. The elevation is over 9,000′ at this location.