Christmas in 2004, a 9.1 magnitude earthquake under the Indian Ocean triggered tsunami waves that killed some 230,000 people across a dozen countries.

The boy once known as “Baby 81,” who was pulled from the mud as an infant after the devastating Indian Ocean tsunami in 2004 and reunited with his parents following an emotional court battle, is now a 20-year-old dreaming of higher education.

People are gathering in prayer and visiting mass graves in Indonesia’s Aceh province to mark 20 years since the massive Indian Ocean tsunami, one of modern history’s worst natural disasters