"Londonderry, a county of Ireland, province of Ulster, 40 m. long
and 31 broad, bounded W by Donegal, N by the ocean, S and SW by Tyrone,
and E by Antrim, containing 511,688 English acres, divided into 31 parishes.
Potatoes are the principal crop; and in some parts oats, barley, flax, and
rye, and some wheat are cultivated. Chief rivers, the Foyle or Green river,
the Bann or White river, the Faughan, and the Roe. Pop. 194,099"
from The New London Gazetteer 1826