Arthur's Pass, a mountain pass ( above sea level) in the Southern Alps of the South Island of New Zealand, marks part of the boundary between the West Coast and Canterbury regions. Located 140 km from Christchurch and 95 km from Greymouth, the pass comprises part of a saddle between the valleys of the Otira River (a tributary of the Taramakau River in the west) and of the Bealey River (in the east). Arthur's Pass lies on the border of the Selwyn and Westland districts.