Bangkok , Thailand ( CNN ) -- As the death toll climbed Monday from flooding in Southeast Asia , officials beefed up flood prevention measures to protect Thailand 's capital from rising water . Millions have been affected by the flooding in Thailand and Cambodia , which has been hit by an above-average monsoonal rainy season . As of Monday , 269 people were dead in Thailand and four were missing , according to the country 's Flood Relief Operations Command . Another 207 people were dead in Cambodia , according to the country 's state-run news agency AKP . Patients in two hospitals in Thailand 's Ayutthaya and Nakhon Sawan provinces had to be evacuated after water reached the first floor , the flood operations command said . Multiple tropical systems have moved over the area in recent weeks , enhancing monsoon rains and leading to the flooding . Another low pressure system is forecast to move into Southeast Asia on Tuesday and Wednesday , said Brandon Miller , senior meteorologist for CNN International . On Monday , Thai Prime Minister Yingluck Shinawatra ordered canal dredging and reinforcement of flood-prevention embankments to protect Bangkok , state-run news agency MCOT reported . In addition , three new flood-prevention walls were being built at two locations in Rangsit , in northern Bangkok , and in Taling Chan , in the western part of the city . The government needs another 1.5 million sandbags , MCOT reported . The prime minister called on the private sector to supply them , but said the government will buy all the needed sandbags by Wednesday , the news agency said . The Rojana Industrial Park has halted operations for the time being , director Amara Charoengitwattanagun told MCOT , and the facility may be further damaged if the flooding worsens . One plant in the park , Single Point Parts , evacuated all workers from the premises and built flood prevention embankments around its building , according to MCOT . Meanwhile , Honda Thailand said on its website Monday that its plants in the Rojana park are flooded and will be closed until at least until the end of the week .
Nearly 500 people are dead in Thailand and Cambodia . Officials order measures to protect Bangkok . The region has seen weeks of heavy rain .