Baker Island

http://en.wikipedia.org/wiki/Baker_Island

A small uninhabited atoll, currently claimed by the US. It has an area of 405 acre (164 ha), there is some more submerged land around. It is declared to be a National Wildlife Refuge.

Potential:

A tiny island that can be expanded. Extra perk is an old runway (though probably beyond recovery); there is no water source(Is it? A water seep is mentioned.) or port. More of a showcase example of atolls in general.

Marks:

Uninhabited
Tropical
Atoll
Missing water source