North Cascades National Park is located on the border of British Columbia and which state?

North Cascades National Park is located in Washington State, along the northern border of the state adjacent to British Columbia, Canada. This national park is renowned for its stunning mountain scenery, diverse ecosystems, and numerous glaciers. The region showcases rugged terrain, dense forests, and an abundance of wildlife, making it a prominent area for outdoor recreation and conservation.

With respect to the other states mentioned, Tennessee is located far from the geographical area of the Pacific Northwest where North Cascades National Park is found. Oregon, while it is north of California and south of Washington, does not directly border British Columbia. Idaho also shares a border with Canada, but it is significantly east of the park's location. Thus, Washington is the only correct answer as it directly encompasses North Cascades National Park and shares a border with Canada.