A member of Vietnam Red Cross distributes drinking water to local people in Ben Tre province, Vietnam, March 29, 2016. Due to the strong influence of the El Nino phenomenon, the Mekong Delta in southern Vietnam has encountered once in a century drought since the end of 2015 which seriously affected local people's life. Mekong Delta, Vietnam's largest and most fertile plain, has an area of over 40,000 square kilometers and covers 13 provinces and cities. (Xinhua/VNA)

Local people dig ponds to reserve fresh water in Can Tho province, Vietnam, March 26, 2016. Due to the strong influence of the El Nino phenomenon, the Mekong Delta in southern Vietnam has encountered once in a century drought since the end of 2015 which seriously affected local people's life. Mekong Delta, Vietnam's largest and most fertile plain, has an area of over 40,000 square kilometers and covers 13 provinces and cities. (Xinhua/VNA)

A farmer works on a field severly affected by drought in Bac Lieu province, Vietnam, March 31, 2016. Due to the strong influence of the El Nino phenomenon, the Mekong Delta in southern Vietnam has encountered once in a century drought since the end of 2015 which seriously affected local people's life. Mekong Delta, Vietnam's largest and most fertile plain, has an area of over 40,000 square kilometers and covers 13 provinces and cities. (Xinhua/VNA)

A farmer stands on a field severly affected by drought in Bac Lieu province, Vietnam, March 31, 2016. Due to the strong influence of the El Nino phenomenon, the Mekong Delta in southern Vietnam has encountered once in a century drought since the end of 2015 which seriously affected local people's life. Mekong Delta, Vietnam's largest and most fertile plain, has an area of over 40,000 square kilometers and covers 13 provinces and cities. (Xinhua/VNA)

Local farmers carry withered straw to feed cattle in Ben Tre province, Vietnam, March 29, 2016. Due to the strong influence of the El Nino phenomenon, the Mekong Delta in southern Vietnam has encountered once in a century drought since the end of 2015 which seriously affected local people's life. Mekong Delta, Vietnam's largest and most fertile plain, has an area of over 40,000 square kilometers and covers 13 provinces and cities. (Xinhua/VNA)

A local farmer plants drought-tolerant vegetables in Soc Trang province, Vietnam, March 31, 2016. Due to the strong influence of the El Nino phenomenon, the Mekong Delta in southern Vietnam has encountered once in a century drought since the end of 2015 which seriously affected local people's life. Mekong Delta, Vietnam's largest and most fertile plain, has an area of over 40,000 square kilometers and covers 13 provinces and cities. (Xinhua/VNA)

Photo taken on March 28, 2016 shows a field severly affected by drought in Ca Mau province, Vietnam. Due to the strong influence of the El Nino phenomenon, the Mekong Delta in southern Vietnam has encountered once in a century drought since the end of 2015 which seriously affected local people's life. Mekong Delta, Vietnam's largest and most fertile plain, has an area of over 40,000 square kilometers and covers 13 provinces and cities. (Xinhua/VNA)

A local farmer carries withered straw to feed cattle in Ben Tre province, Vietnam, March 29, 2016. Due to the strong influence of the El Nino phenomenon, the Mekong Delta in southern Vietnam has encountered once in a century drought since the end of 2015 which seriously affected local people's life. Mekong Delta, Vietnam's largest and most fertile plain, has an area of over 40,000 square kilometers and covers 13 provinces and cities. (Xinhua/VNA)

Members of Vietnam Red Cross distribute drinking water to local people in Ben Tre province, Vietnam, March 29, 2016. Due to the strong influence of the El Nino phenomenon, the Mekong Delta in southern Vietnam has encountered once in a century drought since the end of 2015 which seriously affected local people's life. Mekong Delta, Vietnam's largest and most fertile plain, has an area of over 40,000 square kilometers and covers 13 provinces and cities. (Xinhua/VNA)