Select the two adjectives. Don't select any articles (a, an, or the). Madagascar, an island off the coast of Africa, is relatively isolated from the rest of the
world, as a result, the animals that live there are often quite unique.

the best sentence that shows the best placement for the modifier "on the ice" is the one which contains it in the end of the sentence or in its beggining followed by a comma, that indicates it works as adverbial, dislocated in the sentence.

the girl promptly slid on her rollers on the ice.

on the ice, the girl promptly slid on her rollers.