A group of fishermen at a beach of the Indian Ocean in Aceh

A group of fishermen empty their nets at a beach of the Indian Ocean in Aceh, Indonesia. This December 2015 marks the eleventh anniversary of the 2004 Indian Ocean tsunami, or Boxing Day tsunami, on Dec. 26, 2004, which was triggered by a 9.2 earthquake in the Indian Ocean off the west coast of northern Sumatra, Indonesia, and killing an estimated 230,000 people in 13 countries along the Indian Ocean.