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Ullswater is the second largest lake in the English Lake District, being approximately 9 miles (14.5 kilometres) long and 0.75 miles (1200 metres) wide with an average depth of around 200 feet (60 metres).
Many people regard Ullswater as the most beautiful of the English lakes: it has been compared to the superb Lake Lucerne in Switzerland. It is a typical Lake District narrow “ribbon lake” formed after the last ice age when a glacier scooped out the valley floor, the deepened section filled with melt water when the glacier retreated, and it became a lake. The surrounding mountains give Ullswater the shape of an elongated “Z” giving it three separate segments (or “reaches”) which wend their way through the surrounding hills.