Bounded by the Atlantic Ocean on the east, Brazil has a coastline of 7,491 km (4,655 mi).[14] It borders all other South American countries except Ecuador and Chile and occupies 47.3 percent of the continent of South America.[15] Its Amazon River basin includes a vast tropical forest, home to diverse wildlife, a variety of ecological systems, and extensive natural resources spanning numerous protected habitats.[14] This unique environmental heritage makes Brazil one of 17 megadiverse countries, and is the subject of significant global interest and debate regarding deforestation and environmental protection.