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.