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"It is situated on the Mourne, which meets the Finn, one of the principal rivers of the county of Donegal, a mile onward, where, mingling with the tide-water, their united currents, under the name of the Foyle, flow to the ocean. A canal about four miles in length connects the town with the deeper parts of the Foyle, and adds to the facilities of its import and export trade. From the mouth of the canal the Foyle is navigated by vessels of considerable burthen, and a small steamer is employed to tug them to and from Derry."