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A wide view of Halema‘uma‘u from the western rim of Kīlauea caldera, showing the size of the water pond relative to the crater. The water level was measured as being 608 m (1995 ft) below this observation site. USGS photo by M. Patrick. (Public domain.)
A closer look at the water surface. While most of the surface has a yellow-green color, portions along the shoreline have a blue color and seem to correspond to areas of water upwelling. USGS photo by M. Patrick. (Public domain.)