description Hall Arm Overview
Hall Arm is a narrow marine branch of Doubtful Sound in Fiordland, New Zealand. Its deep water and steep cliffs reflect the glacial erosion that formed the sound, while dense coastal rainforest covers much of the surrounding land. Rainfall and runoff create a surface layer of fresh, tannin-stained water above the heavier seawater, a characteristic feature of the region's heavily forested fiords.
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