"A year later, we remember those days of sorrow, and we also recall acts of courage and kindness as America and many other nations rallied to help those in need and provide urgent relief," Bush said in a statement issued by the White House.

"Our nation is proud of the efforts and generosity of our armed services, relief professionals, volunteers, and all those who made contributions to the relief effort.

"We remain committed to helping the citizens of affected nations rebuild their economies, communities, and lives," the US leader said.

More than 220,000 people were killed when waves triggered by a massive earthquake off the coast of Indonesia slammed into a dozen countries exactly one year ago, in one of the deadliest natural disasters ever.

Bush also marked the anniversary with a videotaped message of hope that was broadcast at an emotional ceremony in the capital of Indonesia's Aceh province, where around 168,000 people were killed or left missing by the massive waves.

"Nature is an awesome force and it can inflict great tragedy, yet throughout history, humanity has come back from fire and flood to build anew," the president said in the pre-recorded message.

"One year after the tsunami, Americans of all faiths join nations around the world in the spirit of unity, remembrance and resolve. May Almighty God comfort all those affected by the tsunami and give them strength in the years ahead."

Bush praised Indonesian President Susilo Bambang Yudhoyono for providing "steady leadership for his country" and said "the people of Indonesia are putting their lives back on track."

"We can see signs of hope and new life throughout the region," he said.

The US president also praised the US government and citizens for their contributions to the emergency response and fundraising efforts, with Americans privately giving a total of 1.7 billion dollars to the reconstruction efforts.

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