This remarkable map was created by MoveHub, a site dedicated to expats all over the world. Using data from the CIA on the most commonly used languages in each nation, these travel fans decided to develop a second language map representing nearly every country or state, from Alaska to Kenya.
However, in many cases, only an extremely small percentage of the population uses the language in question. For example, while Australia shows Mandarin as the second language, don't expect half of the population to speak Chinese: in reality, the percentage is only about 1.6%.
Even so, there are a few exceptions, often due to unique historical circumstances. Bosnia and Herzegovina is an interesting example. The country is split into three official languages that are all very similar: Bosnian (spoken by 52.9% of the inhabitants), Serbian (30.8%) and Croatian (14.8%), a particularity inherited from the former Yugoslavia.
Great linguistic diversity is also apparent in Central and South America, as well as in Sub-Saharan Africa. In France, despite a wide variety of regional dialects (Occitan, Breton, Corsican, etc.) none of these have managed to rival the language of Shakespeare.
Overall, the final results are not very surprising. English takes the lead as the most common second language in 55 different countries – far ahead of French, spoken in 14 countries and Russian, spoken in 13.