![]() The vegetation eventually covers the lake's entire surface. ![]() Sphagnum moss, as well as other plants, grow out from the lake's edge. A bog is formed when a lake slowly fills with plant debris. All bogs take hundreds or thousands of years to develop. String bogs have a varied landscape, with low-lying "islands" interrupting the saturated bog ecosystem. Raised bogs are vaguely dome-shaped, as decaying vegetation accumulates in the center. Quaking bogs bounce when people or animals walk on them, giving them their name. Quaking bogs develop over a lake or pond, with bog mats (thick layers of vegetation) about a meter (3 feet) thick on top. Cataract bogs are ecosystems that feature a permanent freshwater stream. Blanket bogs develop in highland areas with significant rainfall: the bog "blankets" an entire area, including hills and valleys. There are several distinct types of bog habitats. The Western Siberian Lowlands cover more than a million square kilometers (386,102 square miles). ![]() The world's largest wetland is a series of bogs in the Siberia region of Russia. They often develop in poorly draining lake basins created by glaciers during the most recent ice age. Bogs are generally found in cool, northern climates. A bog is a freshwater wetland of soft, spongy ground consisting mainly of partially decayed plant matter called peat.
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