A magnitude 9.1 Mw earthquake occurred off the west coast of Sumatra, Indonesia, on December 26, 2004. It was the fourth largest earthquake in the world since 1900 and the largest since the 1964 Prince William Sound, Alaska, earthquake. The earthquake generated a tsunami that caused more casualties than any other in recorded history. The tsunami was recorded nearly world-wide on tide gauges in the Indian, Pacific and Atlantic Oceans. In total, more than 227,898 people were killed or missing and 1,126,900 were displaced by the earthquake and subsequent tsunami in 14 countries in South Asia and East Africa. Map generated using Tsunami Travel Time (TTT) software: calculates first-arrival travel times on a grid for a tsunami generated at an earthquake epicenter. Map contours: 1 hour intervals: red 1-4 hour arrival times, yellow: 5-6 hour arrival times, green: 7-14 hour arrival times, blue: 15-21 hour arrival times. Maps were generated from earthquake epicenters in the NGDC Global Historical Tsunami Database using NGDC 2 Minute Gridded Global Relief Data bathymetry. Maps do not provide the height or the strength of the wave, only the arrival times.