The Cottonwood River is a tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the Dease River

Dease River

The Dease River flows through northwestern British Columbia, Canada and is a tributary of the Liard River. The river descends from Dease Lake, though its ultimate origin is in the headwater of Little Dease Creek at Snow Peak, approximately 50 km to the west of the lake...

 in the Cassiar Country

Cassiar Country

The Cassiar Country, also referred to simply as the Cassiar, is one of the historical geographic regions of the Canadian province of British Columbia...

 of the Northern Interior of British Columbia

British Columbia Interior

The British Columbia Interior or BC Interior or Interior of British Columbia, usually referred to only as the Interior, is one of the three main regions of the Canadian province of British Columbia, the other two being the Lower Mainland, which comprises the overlapping areas of Greater Vancouver...

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

. Rising in the northern Stikine Ranges

Stikine Ranges

The Stikine Ranges are a mountain range in northwestern British Columbia, Canada. They are the northernmost subdivision of the Cassiar Mountains and among the least explored and most undeveloped parts of the province.-Sub-ranges:*Beady Range...

 just east of Toozaza Peak

Toozaza Peak

Toozaza Peak is a tuya in the Stikine Ranges of the Cassiar Mountains in northern British Columbia, Canada, located in the Iverson Creek. Toozaza Peak is the summit of a north-south aligned ridge between the head of Toozaza Creek and the head of the Jennings River, just south of the Jennings'...

, and just south of the origins of the Jennings

Jennings River

The Jennings River is a river in far northern British Columbia, Canada, rising in the northern reaches of the Stikine Ranges of the Cassiar Mountains, at first running southwest, then turning northeast near the Tuya Range to enter Teslin Lake at its southern end, just to the east of the estuary of...

 and Little Rancheria River

Little Rancheria River

The Little Rancheria River is a tributary of the Rancheria River having its origin in the northernmost Stikine Ranges of British Columbia, Canada, and joining its parent stream in the Yukon Territory. The Rancheria is a tributary of the Liard and defines the northern limit of the Stikine Ranges...

 near the border with Yukon

Yukon

Yukon is the westernmost and smallest of Canada's three federal territories. It was named after the Yukon River. The word Yukon means "Great River" in Gwich’in....

, it flows south along the east flank of the Tuya Range

Tuya Range

The Tuya Range is a range of tuyas, located in the Stikine Ranges of the Cassiar Mountains in the far northr of the Canadian province of British Columbia, near its border with the Yukon Territory and to the southwest of Watson Lake, Yukon, which is the nearest major settlement.-Boundaries and...

 to meet the Dease just north of that river's source at Dease Lake

Dease Lake (British Columbia)

Dease Lake is a lake in the Stikine Plateau of the Northern Interior of British Columbia, Canada, located at the head of the Dease River, which flows north then northeast from the lake to join the Liard River...

, between the north end of that lake and McDame Creek

McDame Creek

McDame Creek is a creek located in the Cassiar Land District of British Columbia. The creek flows southeast into Dease River and is south of Good Hope Lake. The creek was discovered in 1874 by a prospector named Henry McDame. McDame Creek was mined for gold in the 1800s...

 and the former mining centre and community of McDame Post.