Johnstone Passage is a coastal waterway located within Yakutat Bay in southeastern Alaska, separating Khantaak Island from the mainland. This saltwater passage connects with several bays and arms between numerous islands and rocks behind Khantaak Island. The passage is characterized by extensive shoaling and rocks throughout the area, and the connecting channels are navigable only for small craft at low water. Local knowledge is strongly advised for navigation due to these hazards. The tidal range is significant, with predictions showing ranges exceeding 13 feet and low tides dropping below zero feet, indicating strong currents that paddlers must plan around. The water is cold, influenced by glacial ice from Disenchantment Bay and Russell Fiord, which can drift into the area as scattered bergs. The passage offers a network of sheltered waterways ideal for exploration by kayak or canoe, with access points noted at locations like Sawmill Cove, which is used as a log dump and has a submerged cable across its entrance, and Redfield Cove, which provides protected anchorage. Wildlife encounters are a highlight, with frequent sightings of sea otters and porpoises reported by paddlers. The surrounding landscape features views of mountains, including Mount Saint Elias, and the many islands and coves provide opportunities for day trips. Weather in the area can be affected by cold winds moving down from glacier slopes, and conditions can change rapidly. Paddlers should be prepared for cold water, potential ice flows, and should consult detailed tide charts and local resources before venturing out.