On 26 December 2004, Boxing Day, a 9.1 magnitude earthquake occurred off the coast of northwest Sumatra under the Indian Ocean, unleashing a devastating tsunami.
It killed an estimated 228,000 people across more than a dozen countries and caused massive damage in Indonesia, Sri Lanka, India, Maldives and Thailand.
The Andaman and Nicobar islands, located just about 100km north of the epicentre, suffered extensive damage when a wall of water, as high as 15 metres (49 ft) in places, hit land just about 15 minutes later.
Countries across the Indian Ocean have been remembering the catastrophic event 20 years on.
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