The remainder of the southern Uí Néill formed the kingdoms of Tethbae, in the north-west midlands, north and west of the River Inny and east of the River Shannon, and Brega in the east midlands, east of the upper part of the River Boyne and its tributary the River Blackwater.
It is situated four miles (6 km) west-southwest of Launceston at the point where the A30 trunk road crosses the River Inny.
Edgeworth's surveying work in Ireland included soundings in the River Inny and the mapping of bogs.
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