An Amazon nation in the Cosmic Era
The Reposians, unlike the rest of Atheus, respect rather than fear the sea. In fact, this respect has grown to border on love and dependence. It is a fact, naturally, that most of Reposian exports are seafoods, and most of its income is from sea-based reasons, from oceanic trading vessels to fish.
The Sanguis Islands is an archipelago nation. Dangerous to sail through them, the people who live there are self-sufficient, independant, stuborn, and resilient.
A kingdom where, if there are multiple princes (princesses can't rule unless they have no siblings), the princes fight to the death in the arena to decide who gets to rule. A simple way to make sure your brother cannot make a bid for the thrown, and keeps the royal blood in one line.