Q: Context: The Redwood National and State Parks (RNSP) are old-growth temperate rainforests located in the United States, along the coast of northern California. Comprising Redwood National Park (established 1968) and California's Del Norte Coast, Jedediah Smith, and Prairie Creek Redwoods State Parks (dating from the 1920s), the combined RNSP contain 139,000 acres (560 km). Located entirely within Del Norte and Humboldt Counties, the four parks, together, protect 45 % of all remaining coast redwood (Sequoia sempervirens) old-growth forests, totaling at least 38,982 acres (157.75 km). These trees are the tallest and one of the most massive tree species on Earth. In addition to the redwood forests, the parks preserve other indigenous flora, fauna, grassland prairie, cultural resources, portions of rivers and other streams, and 37 miles (60 km) of pristine coastline.

Question: where is the redwood forest located on a map? Let's give stream of consciousness first:
The relevant sentence in the passage is: The Redwood National and State Parks (RNSP) are old-growth temperate rainforests located in the United States, along the coast of northern California. Therefore, the final answer is the United States , along the coast of northern California.