Travelers are voting Havasu Falls, Mooney Falls and Navajo Falls as the best of 3 waterfalls in Grand Canyon National Park. You can find 4 waterfalls in Arizona and 138 waterfalls in the country of United States. Our members favorite in Arizona is Havasu Falls and Niagara Falls is the top pick in United States. Want more? Check out our map of waterfalls in Grand Canyon National Park.