When the Drow of Drakkar were ejected from their homeland during the civil war, they were able to take over this abandoned coastal area without too much effort. They founded various enclaves of corsairs, which chaotic nature made it very hard to conquer. But after years of struggle, this coast line was reduced into something manageable by the the Liberation Fleets of Drakkar. After Drakkar was reabsorbed by Cherembryl the Corsair Coast was brought into the empire.
This area is still unruly, with the local populace resorting to piracy whenever they think they can get away with it. The cities of New Drakkar and New Cherembryl have been founded to try and bring order to the region. This has only been a partial success, and the region has yet to reach its potential due to the constant drain of resources and manpower.
Corsair Coast’s Golarian equivalent is Sczarni.