1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
EIDER, a river of Prussia, in the province of SchleswigHolstein. It rises to the south of Kiel, in Lake Redder, flows first north, then west (with wide-sweeping curves), and after a course of 1 1 7 m. enters the North Sea at Tonning. It is navigable up to Rendsburg, and is embanked through the marshes across which it runs in its lower course. Since the reign of Charlemagne, the Eider (originally Agyr Dor — Neptune's gate) was known as Romani terminus imperil and was recognized as the boundary of the Empire in 1027 …
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- Vol. 9, pp. 132-133