| Terp (plural terpen) is a term for a hillock, mound or knoll used for refuge from high tide and floods. Terp means "village" in Frisian: compare English "-thorpe" in placenames. Historical Frisian settlements were built on artificial terpen measuring up to 15 m in height to be safe from the floods in periods of rising sea levels. The first terp-building period dates from 500 BC, the second from 200 BC to 50 BC. In the mid 3rd century, the rise of sea level was so dramatic that the clay district was deserted, and settlers returned only around AD 400. A third terp-building period dates from AD 700 (Old Frisian times). This ended with the coming of the dike somewhere around 1200. During the 18th and 19th centuries many terps were destroyed to use the fertile soil they contained to fertilize farm fields. The largest terp, seen on the picture to the right, is still preserved.Another Dutch word for "terp" is wierde.Many villages in the Dutch province of Friesland still have names which are related to these words, showing that the village was built on a terp. Terp |  |