During the 19th century, cholera spread across the world from its original reservoir in the Ganges delta in India.

19世纪，霍乱由印度恒河三角洲的原始水库传播至世界各地。

It has only been surpassed in density in recent times by the Ganges Delta region between modern Bangladesh and West Bengal in India.

近代以来，只有位于现代孟加拉国和印度西孟加拉邦之间的恒河三角洲地区在人口密度上超过了尼罗河流域。