Portsmouth Square

Portsmouth Square, formerly known as Portsmouth Plaza, and originally known as Plaza de Yerba Buena, or simply La Plaza, is a one-block plaza in Chinatown, San Francisco, California. Portsmouth Square is the first park in San Francisco, predating both Washington Square and Union Square.

Established in the early 19th century, during the period of Mexican California, the plaza was renamed following the U.S. Conquest of California in honor of the USS Portsmouth, the American ship which captured the city. It is bounded by Kearny Street on the east, Washington Street on the north, Clay Street on the south, and Walter Lum Place on the west.