Boundary Pass is located connects Haro Strait with the Strait of Georgia along the Canada-United States boundary; bounded on the N by a line connection East Point (Saturna Island), British Columbia, and Alden Point (Patos Island), Washington; on the SE by a line between Alden Point (Patos Island) and Point Hammond (Waldron Island), then from Sandy Point (Waldron Island) to Charles Point (Stuart Island); on the SW by a line connecting Turn Point (Stuart Island), Washington and Point Fairfax (Moseby Island), British Columbia; and on the W by a line extending from Pelorus Point (Moseby Island) to Wallace Point (North Pender Island), and to Tilly Point (South Pender Island) and then from Teece Point (South Pender Island) to Taylor Point (Saturna Island).
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