Caernarvon kərnär´vən, kär– [key], Welsh Caernarfon, town (1981 pop. 9,506), Gwynedd, NW Wales, on Menai Strait. Petroleum is imported and slate exported. Tourism is important. The castle, begun by Edward I c.1284, is a fine example of a medieval fortress. The Prince of Wales is invested at Caernarvon.

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