Here's a look at what it is:

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SIZE

The addition increases Yosemite's total space of nearly 750,000 acres by 400 acres.

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LOCATION

It forms a new part of Yosemite's western boundary. Visitors travel by it on their way to the Hetch Hetchy reservoir, which supplies San Francisco with drinking water.

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WHAT'S THERE

It features wetlands and a grassy meadow surrounded by tall pine trees on rolling hills. It is home to wildlife with federal and state protection, such as the great grey owl, the largest owl in North American and listed as endangered by California wildlife officials.

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PURCHASE PRICE

The land was bought from a private owner for $2.3 million. Robin Wainwright said he and his wife, Nancy, sold it to the Trust for Public Land at a slight loss. But they prefer that it go to Yosemite so the public can enjoy it, rather than selling it to developer.

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GROUPS INVOLVED

The trust orchestrated the donation, putting up most of the money — $1.53 million. The Yosemite Conservancy contributed $520,000, and anonymous donors put up the rest.