Flood alerts from the centre on Monday warned that Aranyaprathet, Wattana Nakhon, Muang and Wang Somboon districts in Sa Kaeo province are at risk of floods. Kabin Buri, Si Maha Phot, Si Mahosot and Prachantakham districts of Prachin Buri province, and Phanom Sarakham and Ban Pho districts in Chachoengsao province are also at risk.
Floods in Muang and Aranyaprathet districts meanwhile cut off the main roads to Thailand's border with Cambodia.
Road 33, better known as Suwannasorn road, from Kabin Buri district to Aranyaprathet, was under half a metre of water for one kilometre across all four lanes, and Road 359 from Chachoengsao's Phanom Sarakham to Aranyaprathet was also impassible, Highway Police said.