Hollandse IJssel

The name IJssel is thought to derive from the Germanic i sala, meaning "dark water".

The Delta Works included a steel barrier that can be lowered within minutes to block the waterway.

[1] The sea protection constructions were built at the mouth of the Hollandse IJssel in 1957.

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Satellite image of Utrecht metro area showing the upper stretch of the Hollandse IJssel (f).
Satellite image of the northwestern part of the Rhine-Meuse delta showing the lower stretch of river Hollandse IJssel (m).