Hoh Rainforest is one of the largest temperate rainforests in the U.S., located on the Olympic Peninsula in western Washington state. It encompasses 24 square miles of low elevation forest along the Hoh River, ranging from 394 to 2,493 feet. The rainforest receives an average of 140 inches of annual precipitation—among the rainiest places in the United States. The Hoh River valley was formed thousands of years ago by glaciers and is the ancestral home of the Hoh people.