The remainder of the island consists chiefly of pasture and morass.
The river Derwent, rising in the tarns and "gills" or "ghylls" (small streams running in deeply-grooved clefts) north of Sty Head Pass and the Scafell mass flows north through the wooded Borrowdale and forms Derwentwater and Bassenthwaite.
The lochs and tarns are well stocked with brown trout, and the voes and gios, or narrow inlets of the sea with steep rocks on both sides, abound with sea trout.
The Iser, Bober, Aupa, Zacken, Queiss, and a great number of smaller streams also rise among these mountains or on their skirts; and small lakes and tarns are not unfrequent in the valleys.
In Herzegovina, although many of the high mountain tarns are unproductive, the eel-fisheries of the Narenta are of considerable value.
The Ctenopoda comprise two families: (a) the Holopediidae, with a solitary species, Holopedium gibberum (Zaddach), queerly clothed in a large gelatinous involucre, and found in mountain tarns all over Europe, in large lakes of N.
Whairikauri, whose highest point reaches about 1000 ft., is remarkable for the number of lakes and tarns it contains, and for the extensive bogs which cover the surface of nearly the whole of the uplands.
Denticornis, swarm in the ice-cold waters of the highest alpine tarns throughout the entire chain; and the former of these is also a characteristic inhabitant of pools formed from melting snow in the extreme north.
22.214.171.124 Glen lakes 126.96.36.199 Rock-tarns 188.8.131.52 Moraine-tarn 184.108.40.206 Lakes of the Plains
The lakes and water-basins may be classified in four groups, each with its own peculiar scenery and distinct mode of origin - (I) glen lakes, (2) rock-tarns, (3) moraine-tarns, (4) lakes of the plains.
Rock-tarns are small lakes lying in rock-basins on the sides of mountains or the summits of ridges, and on rocky plateaus or plains.
In the Southern Uplands, owing to the greater softness and uniformity of texture of the rocks, rock-tarns are comparatively infrequent, except in Galloway, where the protrusion of granite and its associated metamorphism have reproduced Highland conditions of rock-structure.
In the rocky hill-ranges of the Central Plain rock-tarns occasionally make their appearance.
There are, besides, numerous mountain tarns of small size, most of them in hollows barred by the glacial drift which covers a great part of the district.