Learn French: Afin de trouver cette spécialité à Madagascar, vous devez y aller. - In order to find this specialty in Madagascar, you have to go there.

Since Madagascar is an island that doesn't use a definite article (it is not le Madagascar), we use the preposition à for 'in' or 'to'. This is a common rule for standalone islands, just like à Cuba or à Malte.

What exactly does the y replace in vous devez y aller?

The pronoun y replaces a place or idea introduced by the preposition à. Because the sentence just established the location as à Madagascar, y easily steps in to mean 'there' and avoids repetition.

Could I just use pour instead of afin de?

Yes, pour trouver works perfectly here and means the same thing. Afin de (in order to) is just slightly more formal and elegant. It is a great alternative to sprinkle into your French writing to add variety.

Why is it afin de trouver (infinitive) rather than afin que with the subjunctive?

You only use afin que followed by the subjunctive when the two parts of the sentence have different subjects. Because the person finding the specialty and the person going are the same (vous), French prefers the much simpler afin de followed by the infinitive.