Shan Atoll... looks like a sand bar. Its a coral atoll covered with sand.

The deeps have lots of room to be the home to something large...

Sharn-Tol Island is inhabited by light house keepers and their families. Some time in the distant past, they were attacked and killed. They then got up, brushed the dirt off, and their wounds healed. A bright light then attacked the attackers. A few were left alive, but wounded, to spread the word these people were not to be harmed. The keepers will trade for food with passing ships. They grow plenty of vegetables, and have a few cows for milk. In one of the small buildings they live in, is located a room. A room that has a sign on it, the language seems to vary with each group who live here, 'Return to Home'. After each group's work schedule is changed, they all gather here, and 1-4 at a time, return to their home dimension and universe. No non-light house keeper and family can use this room. The island is 631 square miles.

Porton Island is 43 square miles. Lots of room, but no one lives there.

The light blue area is a shallow area of shoals, reefs, and water deep enough for the passage of ocean going ships. No detailed charts exist of this area.

These islands are at -20 degrees South latitude.