The source of a river, defined as the furthest place in that river from its estuary or confluence with another river, is an elusive concept. In many cases, it's impossible to pinpoint the exact location from where a river begins, because a river has many sources.
It often starts as a small stream but as it flows towards the sea or a lake or another river, the humble stream gathers water from numerous sources such as underground springs, rainwater, bogs, marshes and lakes and becomes a mighty river.
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