Q:Cache River (Illinois) - The Cache River is a 92-mile-long (148 km) waterway in southernmost Illinois in a region sometimes called Little Egypt. The basin spans 737 square miles (1910 km2) and six counties: Alexander Johnson Massac Pope Pulaski and Union. Located at the convergence of four major physiographic regions the river is part of the largest complex of wetlands in Illinois. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Natural Place