Headwater or the source.
Upstream.
headwaters
A stream changes by joining larger bodies of water as it makes it way to the ocean. It begins at the headwaters and then into a tributary river, a river delta, and then to the ocean.
mountains
The source of river is known as its headwaters. In the example of the Mississippi River, its headwaters is Lake Itasca in Minnesota.
A headwater is the place from which the water in the river or stream originates. It is also called the source of the river or stream
A stream is a flow of rain water that is smaller than a river.
River, stream, waterway, brook, canal, or watercourse
A stream or brook can get bigger and become a river.
Rivers normally start on higher ground, perhaps where there is ice melt. The drops gradually join together and become a small stream. The place where a river gets its start is called the source or headwaters.
A river is a large stream of fresh water that flows across land and empties into an ocean, lake, or some other body of water.
a little bed of water flows and the joins a bigger bed of water, where it joins a stream and then another stream to a bigger stream, then a river which joins a bigger river then goes down to a waterfall where it joins a lake.
A stream of water cutting through land is a river.
A River