The Nieuwe Waterweg gives the Port of Rotterdam its deep-water access to the North Sea. From Hook of Holland it stretches for approximately where the waterway continues as the Nieuwe Maas. The very first Nieuwe Waterweg—a breach through the dunes at Hook of Holland—was only long, but in around 1877 the channel was made much larger and wider and the current Nieuwe Waterweg was created. Currently the width of the channel is between and it is dredged to a depth of below Amsterdam Ordnance Datum.