The Taku River watershed is an 18,000 square kilometre (4.5 million acre) unroaded area near the town of Atlin in northwestern British Columbia, Canada. It is the largest pristine and unprotected watershed on the Pacific shore of the Western Hemisphere. The Tulsequah River is part of the larger Taku River watershed with glacial waters that empty into the Taku. The Taku River itself drains into the Pacific Ocean near Juneau, Alaska.

This immense watershed is the homeland of the Taku River Tlingit First Nation and contains habitats representing five biogeoclimatic zones ranging from high plateaus to lush coastal temperate rainforests. It contains some of the richest wildlife habitat on the west coast of North America and is home to grizzly and black bear, moose, sheep, caribou, mountain goat, salmon, and many species of migrating birds and bald eagles. These species thrive here in large numbers due to the area's essentially untouched nature and the fact that the southern part of the territory is only accessible by air craft, river boat, or by foot.

The Taku River is estimated to be the largest salmon producer in all of southeast Alaska and northern British Columbia. The Alaskan portion of the lower Taku represents less than 10% of the total Taku drainage, but consists of biologically critical areas including the estuary and important salmonid rearing habitats for sockeye, Coho, pink, Chinook, steelhead, and chum salmon. In addition to these coastal species, the territory also has a complex and dynamic system with a wide variety of fish habitat types including mainstem, off channel, tributaries, lakes, and wetlands that contain lake trout, bull trout, grayling, pike, round whitefish, lake whitefish, broad whitefish, slimy sculpin, and longnose sucker, as well as many others.

The Taku River watershed is the subject of controversy due to a planned mining project and the construction of a 160 km access road. It is projected that this project will have a long-term negative impact on fish and wildlife habitat, the Taku River Tlingit First Nation, and the ecological integrity of adjacent wilderness areas in both British Columbia and Alaska.

The T'akhu  Tlèn Conservancy

In northern BC, near Atlin BC, The vast watersheds of the Taku and Whiting Rivers along with the headwaters of the Yukon River and portions of the Tagish, Teslin and Atlin Lakes drainages, comprise the traditional territory and the foundation of the culture and heritage of the Taku River Tlingit First Nation (TRTFN). This territory is of international significance because of its wilderness characteristics, diverse wildlife populations, and the presence of wild pacific salmon.

The T'akhu  Tlèn Conservancy is a society that was formed to protect the territory of the TRTFN. The purpose of the Conservancy is to ensure that this landscape remains a place where the needs of the residents are satisfied in harmony with the continued long term viability of its native plants, fish, wildlife, and natural ecosystems.

The objectives of the Conservancy are to develop, fund, facilitate, promote and carry out activities and programs which will preserve the plants, fish, wildlife and natural communities that represent the diversity of life within the territory of the TRTFN according to the direction provided by the Taku River Tlingit First Nation Vision and Management Direction for Land and Resources and the Taku River Tlingit Conservation Area Design.

The goals of the conservancy are to:

Protect, preserve, and manage plants and animals that represent the diversity of life within the territory of the Taku River Tlingit First Nation by protecting the lands and waters they need to survive; and areas of environmental, historical, and First Nations cultural value;

Provide opportunities for training in conservation management, and to provide sustainable employment for under-employed or unemployed individuals residing within the traditional territory of the Taku River Tlingit First Nation for whom such job opportunities do not currently exist;

Acquire property to further the purposes of the Society, such licences, leases, tenures, easements, and conservation covenants over lands within the traditional territory of the Taku River Tlingit First Nation.