How many active volcanoes are there in the world? Which country heads the list?

Including those which are submarine (under the surface of the sea), there are 1,343 active volcanoes. Indonesia, which comprises over 13,600 islands, has 76 historically active volcanoes. About 80% of them erupted in the 20th century. There have been 1,171 eruptions in recorded history of Indonesia. Japan, however, has witnessed 1,274 eruptions.