A total of 35 people were confirmed killed by the flash floods and mudslides in southern provinces of Thailand, authority said on Saturday.

The flash floods and mudslides in southern provinces of Thailand caused by heavy rainstorms that have hit several southern provinces since March 23.

All deaths are Thai nationals, with the most deaths reported in Nakorn Si Thammarat province where 15 people died in floods caused by rains that have pummelled the coastline of the Gulf of Thailand since last weekend.

The freak storm also stranded thousands of tourists on Samui, an island in the Gulf that is popular among Western tourists.

Provinces hit by major flooding are Nakhon Si Thammarat, Phatthalung, Surat Thani, Trang, Chumphon, Songkhla, Krabi and Phangnga, and as many as 998,867 people have been affected.