Thomson Passage is a coastal strait located in Nunavut, Canada. The passage is characterized by significant navigational hazards for paddlers, primarily due to its shallow and obstructed nature. The western end of Thomson Passage is notably shoal, presenting a risk of grounding. Anchorage is possible in the eastern part of the passage. Swan Island marks the western terminus of the water body. Tidal streams in the general area reach 2 to 3 knots, indicating that paddlers must carefully plan their transit times to avoid fighting strong currents. The tidal range in the region is significant enough that a nearby small-craft wharf was constructed in two tiers to compensate for it, suggesting a substantial vertical change between high and low tide that will affect access to shorelines and any potential launch points. The surrounding landscape features islands like Sanderling Island and Rightfoot Islet, and the coastline includes features like Johnston Cove and Melvin Bay, which offer sheltered areas. A conspicuous galvanized metal warehouse and a tower with red lights are noted landmarks on the south side of Johnston Cove. The passage is in a remote Arctic environment with no paddler-specific facilities or amenities, requiring complete self-sufficiency.