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.

Some 1.7 million people were displaced, mostly in the four worst-affected countries: Indonesia, Sri Lanka, India, and Thailand.

Thursday marks the 20 th anniversary of the 2004 Indian Ocean tsunami, one of the deadliest natural ... were published in a 2006 Nature magazine article. Indonesia suffered the worst of the devastation, with more than 170,000 people killed.

People visit areas of mass graves in Banda Aceh, offer prayers for victims of deadly disaster that struck 20 years ago - Anadolu Ajansı

Survivors and families of victims visited mass graves, lit candles and comforted one another across Southeast and South Asia in ceremonies to mark the disaster that killed some 230,000 people.

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

On Dec. 26, 2004, an earthquake-triggered tsunami raced across the Indian Ocean with 40-foot-high waves slamming into India, Thailand, Indonesia and several other countries, killing at least 225,000 people and leaving thousands injured.

People gathered in India and Sri Lanka on Thursday to mark 20 years since the Indian Ocean tsunami struck , killing thousands of people.