In 1848, San Francisco Bay looked much different than it does today. At one time, the largest part of this estuary had an area defined by approximately ________.
30 × 80 km 20 × 40 km 40 × 150 mi 40 × 50 mi 15 × 40 km
In 1848, the largest part of San Francisco Bay had an area defined by approximately 30 × 80 km.