 Seahawks fans have been referred to collectively as the "12th Man", "12th Fan", or "12s".The team's fans have twice set the Guinness World Record for the loudest crowd noise at a sporting event, first registering 136.6 decibels during a game against the San Francisco 49ers in September 2013, and later during a "Monday Night Football" game against the New Orleans Saints a few months later, with a then record-setting 137.6 dB.The Seahawks are the only NFL franchise based in the Pacific Northwest region of North America, and thus attract support from a wide geographical area, including some parts of Oregon, Montana, Idaho, and Alaska, as well as Canadian fans in British Columbia, Alberta and Saskatchewan.