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Rh to perpetual variation owing, on the one hand, to the erosion of the coasts, and, on the other, to reclamation of land by means of endiking and drainage operations. In 1889 the total area was calculated at 12,558 sq. m., and, including the Zuider Zee and the Wadden (2050 sq. m.) and the Dutch portion of the Dollart (23 sq. m.), 14,613 sq. m. In no country in Europe has the character of the territory exercised so great an influence on the inhabitants as in the Netherlands; and, on the other hand, no people has so extensively modified the condition of its territory as the Dutch. The greatest importance attaches therefore to the physical conformation of the country.

The coast-line extends in a double curve from south-west to north-east, and is formed by a row of sand dunes, 171 m. in length, fringed by a broad sandy beach descending very gradually into the sea. In the north and south, however, this line is broken by the inlets of the sea which form the Frisian and the South Holland and Zeeland islands respectively; but the dunes themselves are found continued along the seaward side of these islands, thus indicating the original continuity of the coast-line. The breadth of the dunes naturally varies greatly, the maximum width of about 4375 yds. being found at Schoorl, north-west of Alkmaar. The average height of the individual dune-tops is not above 33 ft., but attains a maximum of 197 ft. at the High Blinkert, near Haarlem. The steepness of the dunes on the side towards the sea is caused by the continual erosion, probably traceable, in part at least, to the channel current (which at mean tide has a velocity of 14 or 15 in. per second), and to the strong west or north-west winds which carry off large quantities of material. This alteration of coast-line appears at Loosduinen, where the moor or fenland formerly developed behind the dunes now crops out on the shore amid the sand, being pressed to the compactness of lignite by the weight of the sand drifted over it. Again, the remains of the Roman camp Brittenburg or Huis te 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 tendency of the dunes to drift off on the landward side is prevented by the planting of bent-grass (Arundo arenaria), whose long roots serve to bind the sand together. It must be further remarked that both the “dune-pans,” or depressions, which are naturally marshy through their defective drainage, and the geest grounds—that is, the grounds along the foot of the downs—have been in various places either planted with wood or turned into arable and pasture land; while the numerous springs at the base of the dunes are of the utmost value to the great cities situated on the marshy soil inland, the example set by Amsterdam in 1853 in supplying itself with this water having been readily followed by Leiden, the Hague, Flushing, &c.

As already remarked, the coast-line of Holland breaks up into a series of islands at its northern and southern extremities. The principal sea-inlets in the north are the Texel Gat or Marsdiep and the Vlie, which lead past the chain of the Frisian Islands into the large inland sea or gulf called the Zuider Zee, and the Wadden or “shallows,” which extend along the shores of Friesland and Groningen as far as the Dollart and the mouth of the Ems. The inland sea-board thus formed consists of low coasts of sea-clay protected by dikes, and of some high diluvial strata which rise far enough above the level of the sea to make dikes unnecessary, as in the case of the Gooi hills between Naarden and the Eem, the Veluwe hills between Nykerk and Elburg, and the steep cliffs of the Gaasterland between Oude Mirdum and Stavoren. The Dollart was formed in 1277 by the inundation of the Ems basin, more than thirty villages being destroyed at once. The Zuider Zee and the bay in the Frisian coast known as the Lauwers Zee also gradually came into existence in the 13th century. The extensive sea-arms forming the South Holland and Zeeland archipelago are the Hont or West Scheldt, the East Scheldt, the Grevelingen (communicating with Krammer and the Volkerak) and the Haringvliet, which after being joined by the Volkerak is known as the Hollandsch Diep. These inlets were formerly of much greater extent than now, but are gradually closing up owing to the accumulation of mud deposits, and no longer have the same freedom of communication with one another. At the head of the Hollandsch Diep is the celebrated railway bridge of the Moerdyk (1868–1871) 1607 yds. in length; and above this bridge lies the Biesbosch (“reed forest”), a group of marshy islands formed by a disastrous inundation in 1421, when seventy-two villages and upwards of 100,000 lives were destroyed.

Besides the dunes the only hilly regions of Holland are the southern half of the province of Limburg, the neighbourhood of Nijmwegen, the hills of Utrecht, including the Gooi hills, the Veluwe region in Gelderland, the isolated hills in the middle and east of Overysel and the Hondsrug range in Drente. The remainder of the country is flat, and shows a regular downward slope from south-east to north-west, in which direction the rivers mainly flow. The elevation of the surface of the country ranges between the extreme height of 1057 ft. near Vaals in the farthest corner of Limburg, and 16-20 ft. below the Amsterdam zero in some of the drained lands in the western half of the country. In fact, one quarter of the whole kingdom, consisting of the provinces of North and South Holland, the western portion of Utrecht as far as the Vaart Rhine, Zeeland, except the southern part of Zeeland-Flanders, and the north-west part of North Brabant, lies below the Amsterdam zero; and altogether 38% of the country, or all that part lying west of a line drawn through Groningen, Utrecht and Antwerp, lies within one metre above the Amsterdam zero and would be submerged if the sea broke down the barrier of dunes and dikes. This difference between the eastern and western divisions of Holland has its counterpart in the landscape and the nature of the soil. The western division consists of low fen or clay soil and presents a monotonous expanse of rich meadow-land, carefully drained in regular lines of canals bordered by stunted willows, and dotted over with windmills, the sails of canal craft and the clumps of elm and poplar which surround each isolated farm-house. The landscape of the eastern division is considered less typical. Here the soil consists mainly of sand and gravel, and the prevailing scenery is formed of waste heaths and patches of wood, while here and there fertile meadows extend along the banks of the streams, and the land is laid out in the highly regular manner characteristic of fen reclamation (see ).

The entire drainage of Holland is into the North Sea. The three principal rivers are the Rhine, the Maas (Meuse) and the Scheldt (Schelde), and all three have their origin outside the country, whilst the Scheldt has its mouth only in Holland, giving its name to the two broad inlets of the sea which bound the Zeeland islands. 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. The Ysel and the Vecht flow to the Zuider Zee; the other branches to the North Sea. The Maas, whose course is almost parallel to that of the Rhine, follows in a wide curve the general slope of the country, receiving the Roer, the Mark and the Aa. Towards its mouth its waters find their way into all the channels intersecting the South Holland archipelago. The main stream joining the Waal at Gorinchem flows on to Dordrecht as the Merwede, and is continued thence to the sea by the Old Maas, the North, and the New Maas, the New Maas being formed by the junction of the Lek and the North. From Gorinchem the New Merwede (constructed in the second half of the 19th century) extends between dykes through the marshes of the Biesbosch to the Hollandsch Diep. These great rivers render very important service as waterways. The mean velocity of their flow seldom exceeds 4.9 ft., but rises to 6.4 ft. when the river is high. In the lower reaches of the streams the velocity and slope are of course affected by the tides. In the Waal ordinary high water is perceptible as far up as Zalt Bommel in Gelderland, in the Lek the maximum limits or ordinary and spring tides are at Vianen and Kuilenburg respectively, in the Ysel above the Katerveer at the junction of the Willemsvaart and past Wyhe midway between Zwolle and Deventer; and in the Maas near Heusden and at Well in Limburg. Into the Zuider Zee there also flow the Kuinder, the Zwarte Water, with its tributary the Vecht, and the Eem. The total length of navigable channels is about 1150 m., but sand banks and shallows not infrequently impede the shipping traffic at low water during the summer. The smaller streams are often of great importance. Except where they rise in the fens they call into life a strip of fertile grassland in the midst of the barren sand, and are responsible for the existence of many villages along their banks. Following the example of the great Kampen irrigation canal in Belgium, artificial irrigation is also practised by means of some of the smaller streams, especially in North Brabant, Drente and Overysel, and in the absence of streams, canals and sluices are sometimes specially constructed to perform the same service. The low-lying spaces at the confluences of the rivers, being readily laid under water, have been not infrequently chosen as sites for fortresses. As a matter of course, the streams are also turned to account in connexion with the canal system—the Dommel, Berkel, Vecht, Regge, Holland Ysel, Gouwe, Rotte, Schie, Spaarne, Zaan, Amstel, Dieze, Amer, Mark, Zwarte Water, Kuinder and the numerous Aas in Drente and Groningen being the most important in this respect.

It is unnecessary to mention the names of the numerous marshy lakes which exist, especially in Friesland and Groningen, and are connected with rivers or streamlets. Those of Friesland are of note for the abundance of their fish and their beauty of situation, on which last account the Uddelermeer in Gelderland is also celebrated. The Rockanje Lake near Brielle is remarkable for the strong salty solution which covers even the growing reeds with a