Lek lĕk [key], northern arm of the Rhine River, 40 mi (64 km) long, branching from the Neder Rijn (Lower Rhine), central Netherlands, and flowing W into the Nieuwe Maas (New Meuse) River. It is navigable for its entire length. Rotterdam , the chief city on the river, is connected with the North Sea by the Nieuwe Waterweg (canal).

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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