Sea of Time Islet

The Sea of Time Islet is a small island located southeast of the Sea of Time and explorable in Golden Sun: The Lost Age. It is only inhabited by two old men and a tiny one-room hut, who serve to drop hints about how to defeat Poseidon. Also on the island is a turtle named Lonesome George, who desires a turtle friend of his own to break up the loneliness.

This is by no means an insignificant location from a gameplay perspective. If you give Lonesome George the Lil' Turtle "item" acquired from a dog at West Indra Islet, it will agree to ferry you to a nearby cave entrance in the water, which is the entrance to none other than the optional dungeon Islet Cave. If you have the Teleport Psynergy, you can level-grind against the EXP-rich Wonder Birds within, and battle the optional boss Sentinel to earn the Summon tablet Catastrophe.

Trivia

 * Some players have noticed that the old man on the beach doesn't turn to you when you start talking to him. This could be due to a glitch in the programming.
 * The turtle Lonesome George is a reference to the real-world Lonesome George, who is the last remaining tortoise of his species.