With a population of 156 million, Bangladesh ranks amongst the world's most populous nations. What makes the situation worse is that most of the country is situated on the low-lying Ganges delta, formed by the confluence of three major rivers - Ganges, Brahamputra and Meghna. As a result, it is highly susceptible to flooding especially during the rainy season from July to October, when the rivers rise as much as 12-feet, making many areas accessible only by boat.