Infrastructure in Aceh has been rebuilt and is now more resilient than before the tsunami struck. Early warning systems have been installed in coastal areas to alert residents of incoming

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

The earthquake and tsunami claimed the lives of over 200,000 people, the deadliest natural disaster of the 21st century.

In Thailand, people gathered at a memorial ceremony in Ban Nam Khem, a small fishing village in Phang Nga province that bore the brunt of the devastating wave in the country. The tsunami claimed the lives of over 8,000 people in Thailand. Many remain missing and nearly 400 bodies are unclaimed to this day.

At one in Ulee Lheue village, where 14,000 unidentified victims are buried, families of those killed by the tsunami wept and placed flowers. There were similar memorial ceremonies in Ban Nam Khem, a small fishing town in Thailand that was among those most devastated by the tsunami in the country,

Under the shade of trees at a mass grave in Indonesia's Aceh province, survivors and mourners recited Islamic prayers, commemorating the deaths of tens of thousands killed when a tsunami decimated the area two decades ago.