The number of people impacted by the floods in Pakistan right now is the size of a small country.

Swaths of the country are now underwater, after what United Nation officials have described as a “monsoon on steroids” brought the heaviest rainfall in living memory and flooding that has killed 1,162 people, injured 3,554 and affected 33 million since mid-June.

Pakistan flood created a 100km-wide lake, satellite images show - CNN

Population (millions)
Sri Lanka 22.2
Australia 25.8
Ghana 31.7
Malaysia 32.8
Pakistan (as of August 27) 33
Peru 33.4
Uzbekistan 34.9
Saudi Arabia 35.3