The Port of Oakland is a major container ship facility located in Oakland, California, in the San Francisco Bay. In 1852, large shipping wharves were constructed along the Oakland Estuary, and the shipping channel was deepened in 1874 to make Oakland a deep-water port. The port began to admit container ships in 1962, making Oakland the second-largest port in the world in terms of container tonnage by the late 1960s. However, the late 1970s saw the ports of Los Angeles and Long Beach surpass Oakland due to depth and navigation restrictions in the bay. In 2011, Occupy Oakland protesters blocked traffic at the port, and, in 2014, pro-Palestinian protesters prevented an Israeli ship from unloading its cargo for four days.