The Chuckanut Mountains, or Chuckanuts, are located on the northern Washington state coast of the Salish Sea, just south of Bellingham, Washington, United States. Being a part of the Cascade Range, they are the only place where the Cascades come west down to meet the sea. The Chuckanuts are considered to be a part of the Puget Lowland Forest …The Chuckanut Mountains, or Chuckanuts, are located on the northern Washington state coast of the Salish Sea, just south of Bellingham, Washington, United States. Being a part of the Cascade Range, they are the only place where the Cascades come west down to meet the sea. The Chuckanuts are considered to be a part of the Puget Lowland Forest Ecoregion.