Beware the Odd Angles
The peninsula is a chain of hills (47 in the city itself) breaking in steep sand dunes along the bay shore. As the city grew with the influx of the Gold Rush, the hills were mined and leveled off and the excess soil dumped into the bay. Ships abandoned by gold-digging deserters were used as temporary shelters, saloons, and jails, then built over as the city expanded into Yerba Buena Cove and the bay. Bay Street marks the original waterline to the north. As San Francisco became more refined, Golden Gate Park was coaxed into being on the shifting sand dunes with imported soil and well water.