The Quinault Rain Forest is a temperate rain forest, which is part of the Olympic National Park and the Olympic National Forest in the U.S. state of Washington in Grays Harbor County and Jefferson County. The rain forest is located in the valley formed by the Quinault River and Lake Quinault. The valley is called the "Valley of the Rain Forest Giants" because of the number of record size tree species located there. The largest specimens of Western Red Cedar, Sitka Spruce, Western Hemlock, Alaskan Cedar and Mountain Hemlock are found in the forest as well as five of the ten largest Douglas-firs. The forest receives an average of 12 feet of rain per year. It is believed to be the area with the greatest number of record size giant tree species in the smallest area in the world.