TOPSHOT - An Indian woman sits inside her houses immersed in flood waters in Ernakulam district of Kochi, in the Indian state of Kerala on August 10, 2018. - Flash floods have claimed at least 27 lives in the southern Indian state of Kerala, officials said on August 10, prompting the US to advise its citizens to stay away from the tourist hotspot. (Photo by - / AFP)        (Photo credit should read -/AFP/Getty Images)
TOPSHOT - An Indian woman sits inside her houses immersed in flood waters in Ernakulam district of Kochi, in the Indian state of Kerala on August 10, 2018. - Flash floods have claimed at least 27 lives in the southern Indian state of Kerala, officials said on August 10, prompting the US to advise its citizens to stay away from the tourist hotspot. (Photo by - / AFP) (Photo credit should read -/AFP/Getty Images)
PHOTO: -/AFP/AFP/Getty Images
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(CNN) —  

Dozens of people have been killed, and tens of thousands more evacuated, after “unprecedented” flash flooding in a tourist hotspot in southern India.

At least 37 people have died since heavy monsoonal rains first struck the state of Kerala on Wednesday, the state’s relief commissioner P.H. Kurian told CNN on Sunday.

The area, located on the tropical Malabar Coast, is famed for its network of idyllic waterways.

Another 40,000 people living in low-lying areas have now been evacuated to 350 relief camps, as the downpour caused landslides and overflowed reservoirs.

The Shiva Temple in Kochi, Kerala state, is partially submerged on August 9.
The Shiva Temple in Kochi, Kerala state, is partially submerged on August 9.
PHOTO: -/AFP/AFP/Getty Images

Monsoon rains are to be expected in India this time of the year. But after days of abnormally heavy rains, authorities on Friday opened the shutters of water reservoirs in an effort to prevent potentially disastrous breaches.

“Our state is in the midst of an unprecedented flood havoc,” explained Kerala chief minister Pinarayi Vijayan, in a statement Friday.

“For the first time in history, 27 dams in the state had to be opened. Never before has the state witnessed a calamity of this scale,” the minister added.

An Indian man steers his boat past houses immersed in flood waters in Kochi, in Kerala state, on Friday.
An Indian man steers his boat past houses immersed in flood waters in Kochi, in Kerala state, on Friday.
PHOTO: -/AFP/AFP/Getty Images

Over 400 rescue workers from the National Disaster Response Force (NDRF) have been deployed to help with the relief effort, according to the Indian Home Ministry.

More members of the army, navy and coast guard have also been sent in to assist.

While the rain has eased in recent days, more heavy rains are expected, according to Indian Meteorological Department.

A number of tourists were also caught up in the flooding, including 54 holidaymakers who were rescued from the Plum Judy private resort on Friday.

CNN’s Sugam Pokharel reported from New Delhi, Sheena McKenzie wrote in London.