The now-protected Castle region (dark green) sits right at the top end of Waterton-Glacier International Peace Park. The Flathead River Valley in B.C. and Montana is outlined in blue. Map courtesy of Flathead Wild.
In the United States, the Yellowstone to Yukon Conservation Initiative is a 501(c) 3 tax-exempt organization, IRS #81-0535303. In Canada, the Yellowstone to Yukon Conservation Initiative Foundation is a registered 149(1)(f) charity, #86430 1841 RR0001.