The Berkeley Pier is a pier

Pier

A pier is a raised structure, including bridge and building supports and walkways, over water, typically supported by widely spread piles or pillars...

 in Berkeley, California

Berkeley, California

Berkeley is a city on the east shore of the San Francisco Bay in Northern California, United States. Its neighbors to the south are the cities of Oakland and Emeryville. To the north is the city of Albany and the unincorporated community of Kensington...

. When constructed, the pier extended 3.5 miles (5.6 km) into San Francisco Bay

San Francisco Bay

San Francisco Bay is a shallow, productive estuary through which water draining from approximately forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains, enters the Pacific Ocean...

 from the end of University Avenue. Due to extensive filling of the bay and the creation of the Berkeley Marina

Berkeley Marina

The Berkeley Marina is the westernmost portion of the city of Berkeley, California, located west of the Eastshore Freeway at the foot of University Avenue on San Francisco Bay...

, it presently extends only 2.5 miles (4.1 km). Currently, only the first 3000 ft (0.9 km) are maintained and open to the public.
In the mid-19th century, two private wharfs were built along the Berkeley waterfront.