San Quentin is a state prison located in Marin County, California. It was established in 1852 and is the oldest prison in the state. San Quentin houses male inmates and is known for its high-profile prisoners, including those convicted of serious crimes. The facility includes a death row and has been the site of numerous executions over the years. The prison is situated on the shores of San Francisco Bay and has a capacity of around 3,000 inmates. San Quentin also offers various rehabilitation programs aimed at reducing recidivism. The prison's history and operations have made it a significant part of discussions surrounding the U.S. criminal justice system and capital punishment.