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The European Space Research and Technology Centre (ESTEC) is the European Space Agency's main technology development and test centre for spacecraft and space technology. It is situated in Noordwijk, South Holland, in the western Netherlands, although several kilometers off the village but immediately linked to the most Northern district of the nearby town Katwijk.

For the Oude Rijn branch in Gelderland Province, see: Oude Rijn (Gelderland).The Oude Rijn (Old Rhine) is a branch of the Rhine delta in the Dutch provinces of Utrecht and South Holland. Its present-day length is 52 kilometres.In Roman times, it was the main Rhine branch, forming the northern border of the Roman Empire.