Hudson Bay main stem river at .) Colorado River of the United States and Mexico — longest Gulf of California main stem river at . Columbia River of Canada and the United States — longest eastern Pacific Ocean main stem river at . See also Geography of the Americas Geography of North America Geography of South America Extreme points of the Earth Extreme points of the Americas Extreme points of North America Extreme points of Central America Extreme points of the Caribbean Extreme points of South America Notes References External links Geography of the Americas Americas