"A huge ancient fish trap has been found in an estuary after it was spotted in aerial photographs on Google Earth.The 260m (853ft) man-made V-shaped structure could be more than 1,000 years old, experts believe.
They think it was designed to catch migratory fish, such as salmon and sea trout going up the River Teifi at Poppit in Pembrokeshire. "
http://news.bbc.co.uk/1/hi/technology/7948176.stm
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