Fifty additional miles of Northern California coast will be protected from oil drilling, as of Tuesday.
The federal government has doubled the size of two marine sanctuaries off the Sonoma and Mendocino coasts -- the largest expansion of national marine sanctuaries in California in 20 years.

The renamed Greater Farallones National Marine Sanctuary grows from 1,811 square miles to 4,581 square miles
The area -- from the Farallon Islands, north to Mendocino -- is home to humpback whales, harbor and elephant seals, and thousands of shorebirds.
The expansion prohibits offshore oil drilling and was widely supported via public comments and hearings, according to the National Oceanic and Atmospheric Administration.