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Archipelago(West) Frisian Islands
Adjacent bodies of waterNorth Sea, Wadden Sea
Length15 km (9.3 mi)
16th-century map of Groningen with the islands of Bosch and Rottumeroog at the location of Monnikenlangenoog

Monnikenlangenoog (Dutch pronunciation: [ˈmɔnɪkə(n)ˌlɑŋənˌoːx]; English: Monks' Long Island), also called Moenkelangenoe, was a West Frisian island in the Wadden Sea. It was situated off the coast of present-day Groningen in the Netherlands, between the islands of Schiermonnikoog and Borkum.[1]

Monnikenlangenoog was 12 to 14[1] or 15[2] km long. During summers, the island was used for animal farming, which was of economic importance. In the 14th century, the island was the property of the St. Juliana's Abbey in Rottum and the Old Abbey in Kloosterburen, both on the mainland.[1]

Between 1400 and 1570 CE, Monnikenlangenoog was split into the islands Rottumeroog and Bosch. Rottumeroog still remains today, but Bosch has disappeared.[2]


  1. ^ a b c (in Dutch) "Waddeneiland blijft spoorloos", NOS Nieuws, 2012. Retrieved on 17 April 2014.
  2. ^ a b (in Dutch) "Verzonken waddeneiland Moenkenlangenoe ontdekt", Dagblad van het Noorden, 2012. Retrieved on 17 April 2014.

Coordinates: 53°32′28″N 6°32′00″E / 53.5412°N 6.5334°E / 53.5412; 6.5334