The Intertwine Alliance, says their website, is "simply the name we've given to the amazing network of parks, trails and natural areas in the Portland-Vancouver area."

They continue: "The Intertwine is our connected network of parks, trails and natural areas in the Portland, Oregon and Vancouver, Washington region. The Intertwine provides unparalleled opportunities to preserve natural areas, open spaces, water and wildlife habitat. The Intertwine reflects our region’s passion for quality of life by encouraging recreation, connection to nature, and active transportation like walking, running and biking. As our urban areas grow denser, The Intertwine promotes the health and happiness we, as citizens of the Pacific Northwest, so dearly value."

July 22, 2011 Oregonian article about the Intertwine: "Portland-based Intertwine Alliance bands together to start a natural spaces movement"