More than 100 elephants at the Elephant Nature Park in Chiang Mai province were moved to higher ground to escape rapidly rising flood waters, an employee who gave her name as Dada, told AFP.
But two elephants -- named in local media as 16-year-old Fahsai and 40-year-old Ploython, who was blind -- were found dead on Saturday.
"My worst nightmare came true when I saw my elephants floating in the water," Saengduean Chailert, the director of the Elephant Nature Park in northern Thailand, told local media.
"I will not let this happen again, I will not make them run from such a flood again," she said, vowing to move them to higher ground ahead of next year's monsoon.
In Chiang Mai city centre, people waded through muddy water close to knee height in the night bazaar, and water flowed into the central train station, which has now been closed.
Tourists were forced to evacuate hotels and a local TV station showed a monk carrying a coffin through floodwaters to a cremation site.
Major inundations have struck parts of northern Thailand as recent heavy downpours caused the Ping River to reach "critical" levels, according to the district office. The water level peaked on Saturday but had receded slightly by Sunday.
Thailand's northern provinces have been hit by large floods since Typhoon Yagi struck the region in early September, with one district reporting its worst inundations in 80 years.
Twenty provinces are currently flooded, the Department of Disaster Prevention and Mitigation said Sunday.
