I came across a nice list of superlatives, "Dünyanın enleri".

                          http://www.bilgicik.com/yazi/dunyanin-enleri/

The definitions follow the same pattern, for instance

                          dünyanın en yüksek dağı ´the highest mountain of the world´

dünya|nın = stem + GEN

en yüksek = superlative

dağ|ı = stem + POSS sg 3rd

It is a good chance for learners to brush up their possessive constructions.

Check also which is dünyanın en çok ekmek tüketen ülkesi and which flag is ay yıldızlı.