Most obscure country in the world per capita

I hope no Indonesians reading this Slate article are offended by the tone of the question "Why don't Indonesians know how to swim?" but in North America Indonesia is amazingly unknown, even in regards to the most basic facts, given its size and population.

I simply note that before the end of the 19th century recreational swimming was a rare activity everywhere, and many sailors around the world did not learn on purpose so that they would go down faster if overboard, rather than struggle futilely.

Image: Indonesian ferry.