Tlall Conservancy is located on the east side of Graham Island, Haida Gwaii, immediately south and east of the small community of Tlell.
It is part of an archipelago-wide system of protected areas that includes Gwaii Haanas National Park Reserve and Haida Heritage Site, several provincial parks and ecological reserves, and ten other heritage site/conservancies. In total, half of the land base of Haida Gwaii is now in protected status. It is 20 kilometres northeast of Sandspit Airport. It includes a 350 hectare fen and marsh area known as the Tlell Pontoons and a large portion of the Tlell River watershed. The Tlell watershed flows north and east into Hecate Strait and consists of the Lella Creek, Feather Creek, Survey Creek and Three Mile creek tributaries.