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Updated: May 7, 2025
Whether a river begins its life on a lake plain, as in the example just cited, or upon a coastal plain lifted from beneath the sea or on a spread of glacial drift left by the retreat of continental ice sheets, such as covers much of Canada and the northeastern parts of the United States, its infantile stage presents the same characteristic features, a narrow and shallow valley, with undeveloped tributaries and undrained interstream areas.
Along the banks of the trunk streams short gullies are slowly lengthening headwards, like growing twigs which are sometime to become large branches. The flat interstream areas are as yet but little scored by drainage lines, and in wet weather water lingers in ponds in any initial depressions on the plain.
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