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.
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.
There is a low, mountainous ridge, called the Zampo Palo, running through it, and its eastern shores have some moderately high bluffs, otherwise the island is low and swampy, and its shores, except the eastern end, are fringed with mud banks.