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.
The north eastern part of the basin is now drained to the North Sea by rivers including the Crouch, Blackwater, Stour and Orwell.
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The axis of the basin runs west-east from Marlborough and Newbury (Berkshire) to Chertsey (Surrey) before swinging slightly north of east through Westminster, passing midway between Chelmsford and Southend-on-Sea (Essex) to the east coast between the estuaries of the Crouch and the Blackwater.
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The bridge spans the River Blackwater connecting the villages of Moy and Charlemont (on the east bank) on the old coaching route between Dungannon and Armagh.
The name of the club comes from the river which runs throughout the parish on its way to meet the River Blackwater.
Most of the district is the Dengie peninsula but a significant area is also the area above the Blackwater Estuary, bounded by the River Blackwater to the west until near Kelvedon, the boundary then continues south of Tiptree to the Salcott inlet on the Blackwater Estuary.
Maldon Marine Lake is a lake in Maldon, a small historic town on the estuary of the River Blackwater in Essex, England has been renowned for its promenade park with its salt water lake.
Charlemont is on the east bank of the River Blackwater and Moy on the west; the two are joined by Charlemont Bridge.
It lies above the River Blackwater, a tributary of the River Boyne, just outside the early ecclesiastical town of Kells in the northwest of County Meath.