Known as the Jewel of Oakland, Lake Merritt was once a place where Ohlone and Miwok Indians fished, hunted, and gathered food. Originally connected to the San Francisco Bay, the circumference of the lake measures 3.4 miles. It’s the largest of its kind, located in an urban area and consisting of fresh and salt-water. A historic landmark named the Necklace of Lights surrounds the lake with 126 lamp posts and 3400 bulbs. It’s also America’s first and oldest wildlife refuge since protected 1870.