Port Alberni is a city located in the province of British Columbia in Canada. It is the location of the head offices of the Alberni-Clayoquot Regional District. The city has a total population of 17,743, and the census agglomeration area a total of 25,396. Port Alberni is a deep port city which lies within the Alberni Valley at the head of the Alberni Inlet, Vancouver Island's longest inlet.
Located at the head of the Alberni Inlet, Port Alberni lies adjacent to this natural harbour as well as the Somass River. The other end of the inlet is located on Barkley Sound, which includes the Broken Group Islands, considered to be one of the best areas for kayaking in the world. Sproat lake is located 10 km west of the city, and the valley is guarded by the snow-covered peaks of the Beaufort range, Mount Arrowsmith and Mount Klitsa, and surrounded by mountains on all sides. Kuth-kah-chulth, is the Nuu-Chah-Nulth name for Mount Arrowsmith.