Mackenzie Bay is a large, shallow coastal inlet of the Beaufort Sea at the terminus of the Mackenzie River delta in the Arctic. Its character is defined by vast, low-relief shorelines, extensive mudflats, and a complex network of channels formed by sediment deposition from North America's longest northward-flowing river. The water is typically turbid due to the high sediment load, creating a distinct plume that extends into the sea. This is a remote and dynamic Arctic marine environment with significant ecological importance. A portion of the bay, including areas referred to as East Mackenzie Bay and West Mackenzie Bay, falls within the Tarium Niryutait Marine Protected Area, established to conserve resources and uphold Inuvialuit harvesting rights. The area is a critical summer habitat for large numbers of beluga whales that use the sheltered waters for calving and feeding. Paddling here is a wilderness expedition requiring advanced planning and self-sufficiency, as there are no developed facilities or amenities. The hydrology is driven by strong seasonal river discharge, which peaks in June and July, and by Arctic tidal forces. Paddlers must be prepared for cold water temperatures year-round and should plan trips for the brief summer open-water season. The surrounding region holds historical significance, as the bay is named for explorer Sir Alexander Mackenzie, who first reached its shores in 1789.