Clements Markham Inlet is a significant saltwater inlet on the northern coast of Ellesmere Island, Nunavut. This remote High Arctic fjord extends more than 50 kilometers inland from the coast, bordered by the Grant Ice Cap and the United States Range. The inlet is formed by a low coastal plain at its mouth, with dramatic glacial and mountainous terrain defining its upper reaches. It is situated within Quttinirpaaq National Park, one of Canada's most northern and isolated national parks, placing the entire area under federal protection and management. The environment is characterized by extreme Arctic conditions, with sea ice present for much of the year and a brief open-water period during the short summer.