a sea-port town of Spain in Biscay, and in the territory of Guipuzcoa, seated on a peninsula on the sea-shore, and on the river Bidassoa. It is small, but well fortified both by nature and art; and has a good harbour, tho' dry at low-water. It is built in the form of an amphitheatre, on the declivity of an hill, and surrounded on the land-side by the high Pyrenean mountains. It is a very important place, being accounted the key of Spain on that side. W. Long. 1. 43. N. Lat. 43. 23.