A donkey (R) and a cow stand next to the weir of a lake which has almost dried up as a consequence of the drought, at Maracas in Bahia state, northeast Brazil May 3, 2012. While a swath of the Brazilian Amazon is under a state of emergency as rivers overflow in one of the worst floods ever, the country's northeastern region faces its worst drought in the last 30 years, affecting well over 500 towns and cities, according to data from different government monitoring agencies. REUTERS/Ricardo Moraes (BRAZIL - Tags: SOCIETY ENVIRONMENT ANIMALS DISASTER)