M., and contains the islands of Marken, Schokland, Urk, Wieringen, and Griend.
The mean depth of the Zuider Zee is 11.48 ft.; depth in the southern basin of the former lake, 19 ft.; at Val van Urk (deep water to the west of the island of Urk), 142 ft.
If a line be drawn from the island of Urk to Marken, and thence westwards to Hoorn (North Holland) and N.N.E.
Of sand, partly in the north about Urk and Enkhuizen, partly in the south along the high shores of Gooi, Veluwe, &c. The shallowness of the sea and the character of its bottom, promising fertile soil, occasioned various projects of drainage.
Urk is already mentioned as an island in 966.
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