Northumberland, UK. About 15 miles north of Newcastle
I know Southumbria from the "Southumbrian rounding" (or "Southern rounding") which made South of the river Humber a change in Old-English pronunciation so that the English say now "stone" instead of "staan"
I'm from Texarkana, AR; a great town in SW Arkansas right on the stateliness with Texas. It's an awesome place to live, big enough to have everything you want or need but small enough to avoid big city problems, ie no traffic issues, low crime rate, low cost of living and housing.