A total of 427 people were confirmed dead and two people were missing in the floods that have inundated the upper part of the country for almost three months, the Disaster Prevention and Mitigation Department reported on Wednesday.

A total of 43 more people were confirmed dead on Tuesday -- 23 people in central province of Ayutthaya, 12 in central province of Suphanburi, four in northeastern province of Surin, three in northeastern province of Mahasarakham, and one in central province of Chainat.

Central province of Nakhon Sawan has the highest death toll of 59 people, following by central province of Phichit, of which 50 people killed by flood.

Flash floods were caused by the heavy monsoon "Nock-Ten" and overflow from several dams in upper part of the country since mid July.

On Saturday, floods still prevail in 26 of 77 provinces and are affecting about 2.1 million people from 720,000 households.

The flood have affected about 3.3 million households and about 9.9 million people in 63 of 77 provinces since July 25.

About 73 main highways in 15 provinces are flooded and cannot be passed and 18 north-bound train routes were canceled.