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Geography, San Francisco County
San Francisco is California's smallest county at just 128 square miles. However two-thirds of that area is either ocean or bay, leaving a little more than 46 square miles of land in the county, the San Francisco city limits. These 46 miles are surrounded on three sides by 30 miles of shoreline. The highest spot in the county is Mt. Davidson at 938 feet, its lowest spot is a bedrock basin below the Golden Gate Bridge with a depth of 351 feet. There are a total of 43 named hills in San Francisco and a number of unnamed ones as well. The longest street in San Francisco is the diagonal-running Mission Street at 7.29 miles in length.

Trivia Question:
Based on established city limits San Francisco is the second smallest major city in the U.S., so what is the smallest? ANSWER
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