French help - Le, la, les, Lui, leur, y, and en.?

Ok so I need help with which (pronoun?) to use. Le/la/les, y, or en. My sentence is "L’île est beau...." I want to say after that "It is beside (a cote de) Africa. (talking about Madagascar.) How would i say "it is beside africa." I know A cote de afrique, but what do i use? (le/la/les, y, or en?)