Circary at the Time: Frisia
Years of Activity: >1240
Map: None, see below.
Monasticon Praemonstratense: (II, 235)
Approximate modern location: Island on the Frisian coast.
Elm-Number [See below]: None.*
Other Comments: Wittewierum had a school and office here, destroyed by fire. In view of the extensive industrialization of this coastline as well as massive flood control projects, it is not surprising that no known trace remains of this island.
* This listing (and the numbers, with a few adjustments after 1995) is based on the map contained in Kaspar Elm's Norbert von Xanten: Adliger, Ordensstifter, Kirchenfürst, Wienand Verlag, Köln, 1984, page 328-329.