Elvas, a town of Portugal in the province of Alemtejo, near the Spanish border, 12 miles N.W. of Badajos. It is situated upon a height which, with two on each side, is defended by a castle, and its situation under former conditions was well-nigh impregnable. The streets are narrow and crooked, but there are many good Moorish houses. The cathedral is a mixture of Moorish and Gothic, and there is a Moorish aqueduct 15 miles long, which crosses a valley on four sets of arches at a height of 250 feet.