On 26 December 2004, a magnitude 9.15 quake off the coast of Indonesia's Aceh province triggered the worst tsunami in history.
The Indian Ocean tsunami killed around 226,000 people in Indonesia, Sri Lanka, India, Thailand and nine other countries – as far away as Somalia in East Africa.
Indonesia's northern province of Aceh bore the brunt of the disaster – around 128,858 people were killed there. Bodies littered the streets, waiting to be collected, and others continued to wash ashore, decaying among piles of debris. Hospitals and morgues struggled to cope with injured victims and bloated corpses.
Popular resorts in Thailand such as Phuket and Phi Phi were swamped by the huge waves, leading to the deaths of thousands of locals and tourists.
As the 10th anniversary of the disaster approaches, photographers have returned to some of the worst hit sites in Indonesia and Thailand to see how they have recovered. Use the slider on each image to compare the photos. Note: This gallery contains graphic images of dead bodies.