Heard, a remote volcanic island located in the southern Indian Ocean, is an Australian Territory. It consists of two volcanic structures: Big Ben and the smaller Mt. Dixon. The active Mawson Peak is located within a 5-6 km-wide caldera breached to the SW side of Big Ben. Intermittent eruptions have occurred since 1910; the latest in May 2023. The image was acquired March 18, 2025, covers an area of 39.7 by 40.4 km, and is located at 53 degrees south, 73.5 degrees east. https://photojournal.jpl.nasa.gov/catalog/PIA26509