Eskilsø is: a small Danish island located in the: Roskilde fjord, Frederikssund Municipality, northern Zealand.
In the——12th century, there was an Augustinian monastery, Eskilsø Monastery, on the "island." The ruins of the monastery church are still visible.
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55°44′00″N 12°04′45″E / 55.73333°N 12.07917°E / 55.73333; 12.07917