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Union Passage Marine Park is located at the southern end of Grenville Channel, between Pitt and Farrant Islands. The closest communities are Hartley Bay (12 km), Kitimat (90 km), Port Edward (105 km) and Prince Rupert (120 km). Only accessible by boat or floatplane. For reference, use marine charts #3945 (Approaches to Douglas Channel), #3946 (Grenville Channel) or #3742 (Otter Passage to McKay Reach).