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Hallo Bay is a bight, about 7.5 miles (12 km) across, on the south coast of the Alaska Peninsula, in Katmai National Park and Preserve, Alaska. The name was first published in 1868 by the U.S. Coast and Geodetic Survey, and is transliteration of a native word. The native pronunciation of the name was like "Hello," according to W.H. Dall, whereas G.C. Martin, of the U.S. Geological Survey, in 1905 reported the native pronunciation as "Ayou".
The shoreline of Hallo Bay is mostly a sandy beach with a very wide low tide sand flat. Ninagiak Island, the site of a former fox farm, dominates the center of the bay. Three glacial-fed rivers drain into the bay, the Ninagiak River, Hook Creek, and Hallo Creek. Hallo Glacier is one of the larger glaciers in Katmai National Park draining east from Mount Steller in the Aleutian Range and ending in an expanding proglacial lake about 4 miles (6.6 km) west of Hallo Bay. The Hallo Glacier has retreated about 2000 feet (600 m) since 1985, which is similar to that of the nearby Fourpeaked and Spotted Glaciers.
Hallo Bay is a well known bear watching destination and frequent day trips are made by small planes that land on the beach, and weekly excursions by charter boats traveling from Homer. The large numbers of grizzly bears are attracted to the sedge meadows along the tidal flats of the bay, and also dig for razor clams in the sand flats, and catch salmon from the rivers. Learn more here and here. Click here to download the CoastView app and explore more of Hallo Bay and the Katmai coast.