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"We meet, at three miles from Newtown-Stewart, the river Derg, which brings down the overflowings of the celebrated lough of that name, as well as the waters of the Mournebeg, and several others of the Donegal streams to the Strule. A little above the con fluence of the Derg and Strule is a large flax-spinning factory. At Ardstraw village, which is a mile above the bridge where we cross the Derg, are some church ruins. A mile below the confluence of the Derg the Strule is augmented by the Douglass Burn, and thence the increased volume of waters is borne down to Strabane under the name of the Mourne river."