Men in Ecuador are said to have the largest penises in the world, while men in Cambodia are said to have the smallest.
This is evident from figures that MailOnline has incorporated into an interactive map.
Ecuadorian men have an average erect height of almost 17.6 cm, the data shows.
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At the other end of the scale, Cambodian men are said to have an average height of just under 4 inches.
Britain and the US are nowhere near the top ten in terms of size.
Neither country appears in the top 50.
Britain comes in 68th with a penis size of 5.2 inches (13.1 cm) and America comes in 60th with 5.4 inches (13.5 cm).
Australia ranks 43rd with an average height of 14.46 cm (5.7 in).
To find out which countries have the largest penises, researchers in Germany reviewed more than 40 recent studies of thousands of men.
Britain comes in 68th with a penis size of 5.2 inches (13.1 cm) and America comes in 60th with men having an average size of 5.4 inches (13.5 cm).
The team collected data on average penis size from almost 90 countries, with the measurements independently verified.
Where possible, the team avoided using studies where men had self-reported their penis size.
In cases where individuals had a fat pad above the penis, this was slightly compressed to aid in measurement.
These were all averaged for each country and then converted into inches to allow comparison between different countries.
The European countries with the largest penis sizes overall were the Netherlands in ninth place with 6.2 inches, France in 11th place with 6.2 inches and Italy in 19th place with 6 inches.
Researchers behind the list said they struggled to find a link between height and penis length, but found that countries with higher obesity rates tended to have smaller members, which could explain the distribution of fat tissue.