Centered at approximately 33 degrees longitude and 20 degrees latitude, the Sonai Sea is bounded by Zhraig Wessex to the north and Lenoch to the south and east. The great island of Lumadair marks where the western edge of the Sonai Sea runs into the Farage Ocean. Its name comes from the Sonaide Bri, the human culture from the portions of Zhraig Wessex and northwestern Lenoch that border the Sonai Sea. The eastern portion that touches Lenoch is called the Gulf of Powys, named after the kingdom of Powys that touches the gulf.