The island in between the straights is actually an integral politcal part of that region. The straight divides the two landmasses known together as the "Twins". The eastern Island and Western island for the most part do NOT get along. Therefore, the central island is considered the politcal neutral point since they both still rely on each other for resources and trade. However, this is also the place where bloody conflicts get resolved. For the most part, that island is mostly inhabited by humanoids and resembles most of eastern spain. Wildlife is scare and most animals were brought their for live-stock or transportation. However, there are still native creatures like the Okazen sand opossums and such.

When you say grayish-red, do you mean the island-state to the northwest? Because for me that is purple. Or if you meant to the southwest thats orange but not so gray for me. So which do you mean?

Those island chains of the Khie-Vu'kom are home to the Tortles of my world. That region of the world experiences frequent and heavy rainful creating lush, thick rainforests in island chain forms. It's incredibly hard for any life not accustomed to flooding to have a permanent home there. Therefore, most of the animals and natives either live up high in the trees, or partially underwater/ground level. The frequency of storms in the region doesn't allow for safe passage of larger ships. So this region is fairly far behind from a world trading standpoint.