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Topography Map
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The Irvine Ranch® forms the geographic heart of Orange County. The 93,000-acre Ranch, located less than an hour south of Los Angeles and about 90 minutes north of San Diego, stretches nine miles along the Pacific coast and 22 miles inland and encompasses more than one-fifth of Orange County's total 798 square miles.
The land that makes up The Irvine Ranch is extremely diverse, and the Master Plan for the Ranch directly responds to the natural features found here.
There are three distinct types of topography on The Ranch: the coast and coastal hills, the central valley and the northern mountains adjacent to the Cleveland National Forest. These topographic features divide the Ranch into three areas: the coastal sector, valley sector and mountain sector. The natural features within each area helped shape the Master Plan and influenced the detailed planning of the residential villages as well as decisions to preserve a significant amount of open space in all three sectors.
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The coastal or southern sector is made up of 35,000 acres and is bordered by the San Diego (405) Freeway and the Pacific Ocean.
The valley sector stretches from the San Joaquin Foothills to the Santiago Hills.
These 22,000 acres of predominantly flat lands make up the central area of
The Irvine Ranch.
The 33,000-acre mountain sector, with Irvine Lake at its center,
covers the northeastern section of the Ranch.
The 122-square-mile San Diego Creek Watershed is The Irvine Ranch's primary
watershed, connecting to the ocean via the Back Bay. The Back Bay covers 736
acres of land and forms the transition from the west end of the coastal hills
to the more level land found between Newport Beach and the Palos Verdes Peninsula.
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