Clements Markham Inlet is a significant coastal inlet on northern Ellesmere Island in Nunavut, Canada, within the boundaries of Quttinirpaaq National Park. The inlet trends southwest for approximately 25 miles from its entrance between Hamilton Bluff and Cape Colan. The surrounding terrain is characterized by a low coastal plain near the inlet, with mountainous regions and glaciers, including the Grant Ice Cap and Turnabout Glacier, located farther inland. A chain of low islands lies off the inlet's west side, which can provide some limited lee from open-water conditions but also indicates complex, island-dotted waters for navigation.

This is an extremely remote High Arctic location with no roads, communities, or developed facilities for paddlers. Access would require a significant expeditionary approach, likely involving air charter to a remote drop-off point and wilderness camping. The area is exposed to the open waters of the Arctic Ocean, leading to potentially high wind exposure and significant fetch, which can generate hazardous sea states. Tidal currents are a primary consideration; paddlers must consult detailed nautical resources for this inlet. The presence of glaciers and ice caps feeding into the region means paddlers must be prepared for cold water temperatures year-round and the potential for ice, including bergs and seasonal pack ice, which can present severe hazards and block access. The water is marine and clarity is typical for Arctic coastal waters.

The landscape is dramatic, featuring stark glacial valleys. One large through valley runs southeast from the head of Clements Markham Inlet, connecting to the interior ice cap. Wildlife may include marine mammals such as walrus and bowhead whales, as evidenced by historical remains in the area. Paddling here is a serious wilderness expedition suitable only for highly experienced, self-sufficient teams with advanced cold-water and remote travel skills. All visitors must comply with Parks Canada regulations for Quttinirpaaq National Park, which governs this entire area.