"God has given us a miracle," said Jamaliah, the mother of Raudhatul Jannah, who went missing when she was just four years old.
Jannah and her seven-year-old brother were carried off when huge waves struck their home in West Aceh district on December 26, 2004.
Jamaliah, 42, and her husband survived the quake-triggered tsunami that killed tens of thousands in Aceh, on western Sumatra island, and had long ago given up hope of finding either of their children alive.
He made inquiries and found out that the girl had been caught up in the tsunami, and was swept from Aceh to some remote islands southwest of the province.
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A fisherman rescued the girl, took her back to the mainland and handed her to his mother, who raised the youngster, according to Jamaliah, who like many Indonesians goes by one name.
After the tip-off from her brother, Jamaliah and her husband visited the girl, now aged 14, in late June -- and discovered it was indeed their daughter who went missing a decade earlier.
"My heart beat so fast when I saw her. I hugged her and she hugged me back and felt so comfortable in my arms," she said, adding that she could not stop the "tears from flowing" during the emotional reunion.
Jannah, who was called Wenni by the elderly woman who raised her, returned to her hometown to be with her parents yesterday.
Her brother, Arif Pratama Rangkuti, also survived after being swept away to the same islands, Jamaliah said, but added his whereabouts were unknown.