How do you get to the island in El Salvadorado?

in that spot with four (?) gates in one big area, I think the gate to the far right leads to the island? I could be wrong because I haven't gone to Selvadorada for a while now...but yeah, one of those gates goes there.

Ah, thanks for the info @Cupid! I've been stumped on how to get there.

Thanks for the help @kalaksed; I've never checked all the gates so it never occurred to me that one of them would lead to the island.