View of the Zapotitán valley and surrounding volcanic vents in western El Salvador

View of the Zapotitán valley and surrounding volcanic vents in western El Salvador, looking out from the northwest flank of San Salvador volcano on vents from the 1917 effusive eruption. Izalco is the conical volcano near the left edge of the horizon, formed by near-continuous eruptions from 1770 to 1958. Santa Ana volcano is the taller of the two edifices just to the right, with older Cerro Verde wedged in between. USGS photo by M. Zoeller.