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The definition of the northern boundary of the state is highly unusual. Most of the boundary between Delaware and Pennsylvania is defined by an arc extending 12 miles (19 km) from the cupola of the courthouse in New Castle, and is referred to as the Twelve-Mile Circle. This is the only true-arc political boundary in the United States. This border extends all of the way to the low-tide mark on the New Jersey shore, which continues down the shoreline until it again reaches the twelve-mile arc in the south; then the boundary continues in a more conventional way in the middle of the main channel (thalweg) of the Delaware River Estuary. A portion of this arc extends into Maryland to the west, and the remaining western border is a tangent to this arc that runs a bit to the east. The Wedge of land between the arc and the Maryland border was claimed by both Delaware and Pennsylvania until 1921, when Delaware's claim was confirmed.

New Castle County is the northernmost of the three counties of the U.S. state of Delaware. As of 2000 its population was 500,265. The county seat is Wilmington. The center of population of Delaware is located in New Castle County, in the town of Townsend. It is the most affluent county in the state of Delaware.

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News from The Delaware News Journal

Exhibit builds new appreciation of prefab homes

Aug 27, 2008 10:23 pm

NEW YORK -- Prefabricated houses don't have to be ticky-tacky.

Home remedies keep gardens free of deer

Aug 27, 2008 10:23 pm

It took hours to get those impatiens looking just right and those pole beans growing, only to have them mowed down by hungry deer.

New rock show, same formula

Aug 27, 2008 10:22 pm

Ever since "A Hard Day's Night" revealed The Beatles as Marx Brothers, rock and comedy have walked hand in hand.

New & notable

Aug 27, 2008 10:22 pm

Get on the water conservation bandwagon and spiff up your lawn while you're at it. Gardeners Supply Co.'s swanky new Wooden Dipping Rain Barrel stores chemical-free rainwater in a European-style dippi...

How to turn a backyard into a butterfly garden

Aug 27, 2008 10:19 pm

Butterflies flutter from the tiny purple petals of the Johnny-jump-ups to the freckled faces of the tiger lilies in Carol Southby's Penfield, N.Y., garden.

Shed your jaundiced view of yellow

Aug 27, 2008 10:18 pm

Step aside, orange. It's yellow's turn to shine.

Navel gazing over, Metallica rediscovers the beast within

Aug 27, 2008 10:01 pm

DALLAS -- Backstage at Ozzfest earlier this month, the four members of Metallica, the headline act for the celebration of heavy metal, seemed calm.

Turner Classic Movies pays tribute to Tony Curtis

Aug 26, 2008 11:13 pm

The classic "Some Like It Hot" is the centerpiece, airing at 8 tonight.

'Traitor' asks, 'Who's the real bad guy?'

Aug 26, 2008 11:11 pm

Spy thriller gives Don Cheadle a layered character fit for his great talent.

Dining abroad

Aug 26, 2008 11:11 pm

On trip to Italy, couple delights in the artful cuisine.

Greg Norman's Southern Cross Developments Selects River Rim Ranch

Greg Norman’s Southern Cross Developments, proprietor of the exclusive “Norman Estates” real estate brand, is pleased to announce that River Rim Ranch in Teton Valley, Idaho will be the location for its newest project, the “Norman Ranch Estates. [Read More]

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