The BBC's Rachel Harvey has met a fisherman in the Indonesian city of Banda Aceh who survived the tsunami.
Anwar was out at sea in his tiny fishing boat when the earthquake struck.
This is his story:
I had gone out fishing after morning prayers. I had been out at sea for about an hour and a half when the earthquake struck.
The boat started shaking. Not long after that the waves got bigger - and the sea turned white with foam.
'Everything was flat. All the houses had gone'
Then I saw that the bridge on the mainland had disappeared. Everywhere was covered with water.
Suddenly a huge wave came towards me, so I turned towards it and really revved my engine.
Somehow I managed to get over it. I don't know how. If I hadn't done that, I would have been tipped over.
The wave was more than 10m high.
When I was over the wave I looked back. Everything was flat. All the houses had gone.
I was so scared. I just sailed around. I was too frightened to go back to land.
But around four o'clock, when everything had calmed down, I did go ashore.
Waves carried boats into the heart of the city
I saw so many people among the debris, just crying for help. I took about 10 of them in my boat. I couldn't find my family.
At about five o'clock I got back on land. The water had already started to go down. I saw dead bodies everywhere on the street.
I went back to my village. There was nothing left. I lost 11 members of my family.
My home used to be close to the sea. Now it's completely destroyed. You can't even see where it was.