Rank: 7
Country: India
No of people at risk: 17.9 million
Image: A Hindu devotee prays on the bank of the Ganges river against the backdrop of Howrah Bridge.
Photograph: Jayanta Shaw/Reuters
Rank: 6
Country: Japan
No of people at risk: 22.9 million
Image: Nagakute area in Nagoya.
Photograph: Reuters