The Seagull Creek map area includes the upper two-thirds of the Seagull Creek drainage area. The creek rises at a high divide (1372 m) in the Pelly Mountains and flows south-southeast for approximately 30 km in a broad, U-shaped valley before joining the McConnell River (1067 m). The drainage area contains summits of up to 2162 m elevation with numerous cirques on north and east-facing aspects. The evidence of glaciation in this landscape is ubiquitous. Most high peaks have been eroded into knife-edge arêtes or horn peaks and cirque basins are currently occupied by active or extinct rock glaciers, tarn lakes, or glacial debris. Valley sides have been over-steepened by glacial erosion and are susceptible to mass movements.
