Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. North Fork Trinity River -  The North Fork Trinity River is a tributary of the Trinity River in the U.S. state of California. It flows south through the Klamath Mountains for about 25 miles (40 km) emptying into the Trinity at Helena about 5 miles (8.0 km) northeast of Junction City. The river drains an area of 151 square miles (390 km2). Important tributaries include the East Fork North Fork Trinity River and Grizzly Creek.
A:
Natural Place