The parkway is a transitional zone in terms of geology with ancient lava beds being found in the north and the granitic rocks of the Teton Range in the south. The Snake River flows through the parkway as it heads south to Jackson Lake and is considered a prime trout fly fishing area. In Grand Teton and Yellowstone, grizzly bears, black bears, moose, elk, bighorn sheep and mule deer can be found there. The Yellowstone fires of 1988 affected the northern sections of the parkway consuming ). As of 2005, the forest had begun to be rejuvenated and wildlife habitat had actually increased due to better mix of meadow and forest lands. A major relocation project for the Flagg Ranch concession operation (consisting of a lodge, gas station, camp store, cabins and a campground) from along the Snake River to a point higher up and less visible from the road was completed in 2002. Rafting is a popular activity during the summer and guided snowmobile tours use the parkway as a starting point for trips into Yellowstone during the winter.