Near the lake the valley was formerly swampy, and at high-water the lake overflowed into it.
Some are found in more or less open plains, while others inhabit swampy districts.
Of this class are the swampy plateaus of the Kola peninsula, sloping gently S.
Although very little of the coast belt is actually swampy, a kind of natural canalization connects many of the rivers at their mouths with each other, though some of these connecting creeks are as yet unmarked on maps.
The Bernam runs through flat swampy country for the greater part of its course, and steam-launches can penetrate to a distance of over 100 m.