the upper parts of a river drainage system

The source and upper part of a stream.

In hydrologic terms, streams at the source of a river.

the upper reaches of a drainage system

geographical description of where a river is born. This location can be from one of several water sources; i.e. lakes, smaller streams, ground springs, and snowmelt to name a few. A river’s headwaters are sometimes referred to as a river’s “mouth”.

Upstream section of the river before the main tributaries join. It is generally smaller and cooler water than the main river after tributaries join.

The small streams and upland areas that are the source of larger streams and rivers.

the source of a river; "the headwaters of the Nile"

The small streams from which a creek or river “rises” or begins.

upstream section of the river before the main tributaries join it. This section is typically much smaller in width and flow than the main section of the river.

The upper reaches of a stream or stream system.

Headwaters are streams and rivers (tributaries) that are the source of a stream or river.

the uppermost reaches of a river or stream.

The point or area of origin for a river or stream.

The small streams on the higher ground of a catchment, which flow into a river.

Small creeks at the upppermost end of a stream system, often found in the mountains, that contribute to larger creeks and rivers.

small rills and creeks at the uppermost end of a stream system; the origin of a stream

The land area or watershed that drains to “first-order streams,” which are the small streams that first define water flowing on the ground from rainfall, snowmelt, or springs.

Small streams which are the upperm...

the source or starting point of a river

The beginning point of a stream.

The upper reaches of a stream near its source.