Horizontal Width: (example) 1,260 km (783 miles) from Nahanni National Park, east to border with Nunavut.
Vertical Length: (example) from Tukloyaktuk southeast to Fort Smith 1,221 km (1,440 miles)
Note: Maximum lengths and widths are point-to-point, straight-line measurements from a Mercator map projection, and will vary some using other map projections