New Horizons took this picture of Io on February 24, 2007 at 13:50. The image is centered on Io's leading hemisphere. An isosceles triangle of three tiny dark dots in the center of the disk are volcanoes called (clockwise from top) Gish Bar, Hi'iaka, and Sigurd Paterae. A larger right triangle of larger dots is formed by (clockwise from top) Shango, Shamshu, and Itzamna Paterae.

NASA / JHUAPL / SwRI