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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

Holidays at Longwood

Dec 1, 2008 8:18 am

The frenzied, three-day conversion to a winter wonderland.

Mind Spa aims to keep your brain fit

Dec 1, 2008 7:04 am

Neurobics Club sees big market in aging population

O Christmas Tree, O Christmas Contest

Dec 1, 2008 6:38 am

Got a beautiful Christmas tree this year, even if you do say so yourself?

Traffic watch

Dec 1, 2008 5:28 am

DelDOT's list of projects that may affect traffic this week.

'Christmases' is tops over T-day weekend

Dec 1, 2008 4:22 am

Thanksgiving weekend movie crowds gobbled up the Reese Witherspoon and Vince Vaughn holiday comedy "Four Christmases," which debuted at No. 1 with $31.7 million, according to studio estimate...

From VP candidate to global celebrity

Dec 1, 2008 1:57 am

Palin juggles duties, offers for everything else

From Scott Weiland's years of trouble, a 'Happy' album emerges

Dec 1, 2008 1:50 am

BURBANK, Calif. -- Behind an unmarked door on a nondescript street in an industrial part of town is Scott Weiland's second home: an old machine shop he transformed into his dream studio.

Potato growers enjoyed a big year

Nov 28, 2008 10:47 pm

Like many of us, Ken Wicks enjoyed mashed potatoes with his Thanksgiving turkey this past Thursday. But, even though he grows 150 acres of potatoes, he had to scrounge around to find enough.

Bound by faith

Nov 28, 2008 10:44 pm

Bestselling novelist Anne Rice is writing a new series of metaphysical thrillers called "Songs of the Seraphim," which may do for angels what her earlier fiction did for vampires.

10 things to do this week

Nov 28, 2008 10:36 pm

So, you're University of Delaware graduate Josh Barton. What are you doing for the holidays? You're opening a new Saladworks restaurant in the Fox Run Shopping Center in Bear. Go help celebrate his op...

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