The El Nino drought in Southeast Asia appears to be getting worse.

While Thailand continues to block rivers feeding the Mekong and divert small volumes, Vietnam said it had recorded the lowest levels of the Mekong River since 1926.

Salinity in the Mekong Delta is a growing problem for Vietnam’s rice bowl and has been made worse by rising sea levels pushing salty water upstream.

Modelling conducted by the Mekong River Commission predicted salt intrusion on Vietnam’s main Mekong channel would reach up to 162 kilometres inland this year, which is nearing the Cambodian border.

A normal year would see salt intruding only 98 kilometres inland.

Thailand is hoping the rainy season comes in late May, but the current El Nino weather pattern has so far exceeded forecasts — meaning South-East Asia’s water resources and regional relations could be further tested.