The number of potential active volcanoes on Earth is estimated to be about 1500, with 550 of these having erupted in recorded history. The total number of volcanoes throughout the entire world is unknown, because not all volcanoes are accessible, known and recorded.
There are volcanoes under oceans that cannot be measured, and there are volcanoes that have been inactive for long periods of time. A large, inactive volcano, named Vulcan, is located in Albuquerque, New Mexico.
Many active volcanoes can be found in the Ring of Fire. This extensive set of volcanoes runs along the eastern, northern and western borders of the Pacific Ocean. It includes volcanoes such as Mount Fuji in Japan, and Mount St. Helens in Washington state.