Tanema is a small offshore rock located near West Harbour on the western coast of Pitcairn Island, close to Matt's Rock and Young's Rock. Its particular significance lies in its historical use in traditional fishing navigation. According to Joshua Nash's 2017 research, local fishermen used Tanema together with the inner rock of Young's Rocks, identified here as Matt's Rock, as two visual reference points to locate an offshore fishing ground known as Out Ha Bear. This provides an example of how small coastal formations became part of Pitcairn's traditional maritime knowledge.