Tarpon is one of three regions, Apari, Nilira and Tarpon, which forms the Kingdom of the Straits.
Tarpon was once the seat of an ancient Kingdom which predated even before the colonies of Apari and Darpartryo was founded. In the 460s-470s it formed one of the core regions in the United Realms.
When Apari broke free Tarpon was effectively splitted in half as House Marcellus, the rulers of Apari, controlled the southern half and House Mecoo, servants of House Darpar - rulers of Falleentium, controlled the northern half. Tarpon was united in 500AER after a treaty made between House Marcellus and House Darpar, making it part of the Grand Duchy of Apari.