The lake is 3.4 miles in circumference, covering 155 acres of land.
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It was donated by Dr. Samuel Merritt in 1869, making it the nation's oldest wildlife refuge. It is naturally filled with a mixture of salt and fresh water, making it the largest of its type in an urban area.
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OVER IT: San Francisco's world-class skyline
OVER IT: San Francisco's world-class skyline