Ullswater, lake, 7 1⁄2 mi (12.1 km) long, Cumbria, NW England; second largest in the country. It is divided into three reaches. The waterfall of Aira Force (65 ft/20 m high) and Helvellyn Mt. are nearby. Gowbarrow, west of the lake, is said to have been the inspiration of William Wordsworth 's poem
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