In Roman times the Rhine at this part of its course seems to have been a full and flowing river, but by the 9th century it had lost itself in the sands of Katwijk, and it was not until the beginning of the 19th century that its way to the sea was re-opened.
Katwyk, or Katwijk, 6 m.
Again, the remains of the Roman camp Brittenburg or Huis to Britten, which originally lay within the dunes and, after being covered by them, emerged again in 1520, were, in 1694, 1600 paces out to sea, opposite Katwijk; while, besides Katwijk itself, several other villages of the west coast, as Domburg, Scheveningen, Egmond, have been removed further inland.
The Rhine in its course through Holland is merely the parent stream of several important branches, splitting up into Rhine and Waal, Rhine and Ysel, Crooked Rhine and Lek (which takes two-thirds of the waters), and at Utrecht into Old Rhine and Vecht, finally reaching the sea through the sluices at Katwijk as little more than a drainage canal.
Similar constructions are to be found on the seaward side of the islands of Walcheren, Schouwen and Voorne, and between 's Gravenzande and Scheveningen, and Katwijk and Noordwijk.
The deep-sea fishery may be further divided into the so-called " great " or " salt-herring " fishery, mainly carried on from Vlaardingen and Maasluis during the summer and autumn, and the " fresh-herring " fishery, chiefly pursued at Scheveningen, Katwijk and Noordwijk.