The largest tsunami on record was triggered by a 9.15 magnitude earthquake under the Indian Ocean on December 26, 2004. The tsunami waves reached heights of up to 49 feet and caused catastrophic damage across multiple countries in Southeast Asia and East Africa. Over 310,000 people lost their lives or were injured across Indonesia, Sri Lanka, India, Thailand and other nations impacted by the devastating waves. The earthquake and resulting tsunami are considered one of the deadliest natural disasters in history.