The native plant life of Central Oregon can be divided between the Ponderosa forests at the foot of the Cascades, and the smaller Western Juniper forests to the east, with the Deschutes River being a rough boundary between the two. Because of the lack of precipitation, high temperatures, and lightning storms during the late summer, wildfires are a common occurrence. Small fires are essential, as they burn away detritus. With the arrival of European settlers, fire suppression became common. However, due to decades of fire suppression, several major wildfires have broken out and threatened large settlements. Major wildfires are becoming less common as the practice of controlled burns by local officials are more frequent. The Oregon Badlands Wilderness preserves the indigenous character, flora, and fauna of the desert basin and is located about east of Bend.