Heavy flooding is worsening in parts of Bangladesh, with over 1 million villagers marooned or leaving their homes for higher ground along with their cattle and other belongings, officials and volunteers said Tuesday. Water levels at major rivers were rising Tuesday at around two dozen points in 20 districts. Many new areas in northern, northeastern and central Bangladesh have been affected over last 24 hours, Arifuzzman Bhuiyan, an executive engineer with the Water Development Board, said by phone. Bangladesh has 64 districts.

“The situation is worsening,” he said. “The worst thing is that the floods are getting prolonged this year, which is a bad sign.” Bhuiyan said heavy rainfall and rushing waters from upstream India were the main reasons for the floods in the delta nation of 160 million people, which receives monsoon rains between June and October every year, often leading to flooding.

The floods started late last month, and after briefly easing continued to worsen, affecting many new areas, destroying crops and driving people from their homes in several impoverished regions. Bangladesh is crisscrossed by 230 rivers, including 53 shared with India.