NASA's Earth Observing-1 satellite images show the Chao Phraya River and the city of Ayutthaya on July 11, 2011 (left) and inundated by flood waters on October 23, 2011. Thailand's worst flooding in half a century, caused by unusually heavy monsoon rain, has killed at least 373 people since mid-July and disrupted the lives of nearly 2.5 million, with more than 113,000 in shelters and 720,000 people seeking medical attention. – Reuters pic