Maryland's northern border is the famous Mason-Dixon line, traditionally the demarcation between North and South.
Russia this week forced Georgia to close its northern border, near Chechnya, to most foreigners.
In any event, Plan Colombia has reminded Brazil that its remote northern border region is wide open.
The King Abdullah camp, near Jordan's northern border with Syria, is one of the smaller camps in the country.
BBC: Prince Charles 'heartbroken' by plight of Syrian refugees
The freezing weather has also caused chaos on Serbia's northern border with Hungary where lorries queued for hours amid heavy snowfall.
Jose Manuel Valenzuela is an expert on music and violence in Mexico at the College of the Northern Border, in Tijuana.
The main revelation here though, according to the scientists, is the extension of the northern border for this ancient tribal practice.
ENGADGET: Alt-week 12.22.12: strange skulls, solar portraits and 17-minute code cracking
The Customs and Border Patrol already conducts unarmed surveillance drone flights on the southern border, the northern border and over the Caribbean.
Much of the poaching has been carried out by gangs from neighbouring Cameroon, with ivory carried across the northern border by porters.
BBC: Poaching boom sees thousands of elephants killed in Gabon
For the first time in over 30 years, the Lebanese authorities have regained control of the turbulent hill-country along Israel's northern border.
They now run a large swath of territory along Syria's northern border with Turkey as well as much of the east, near Iraq.
They were detained trying to cross Nicaragua's northern border in six vans, some of them painted with the logos of Mexico's Televisa network.
BBC: Nicaraguan police seize $7m from fake Mexico journalists
Some 110, 000 of those who have sought shelter in Jordan are living in the desert camp of Zaatari, near its northern border with Syria.
Tension between Kosovo's ethnic Albanian majority and remaining ethnic Serbs has led to violence in recent years, notably along the northern border with Serbia.
One UN mandate coming up for renewal at the end of this month, for example, is in southern Lebanon, along Israel's troubled northern border.
Tension between Kosovo's ruling ethnic Albanian majority and remaining ethnic Serbs has resulted in violence in recent years, notably along the northern border with Serbia.
U.S. and Iraqi military operations along the northern border had also hampered the importing of fuel, but he said the shortage should ease up soon.
In return, the army has accepted a supreme court decision creating a large Indian reserve on Brazil's northern border, a measure it had previously opposed.
Most notably, France refuses to scrap checks on its northern border with Belgium and Luxembourg: it objects to soft drugs' free availability in the Netherlands.
Anaheim, whose natural market stretches from Santa Barbara all the way down to the northern border of San Diego, may soon stand as a better market altogether.
Cabinda is physically separated from the rest of the country by a strip of the DR Congo and has a northern border with the Republic of Congo.
It marks what some people consider the northern border of the Great Basin and sits upon the farthest shore of what author Stephen Trimble calls the Sagebrush Ocean.
Across Iraq's northern border, a different conflict is escalating again.
Eric Westervelt, NPR News, Qiryat Shemona on Israel's northern border.
The underlying problem is common to Mexico's northern border too.
Over the past two decades Mexico's drug mobs have accumulated enormous firepower and wealth, and corrupted local police forces and politicians, especially along the northern border with the United States.
Raqqa city is near Syria's northern border with Turkey and residents say it has become home to thousands of people forced to flee their homes in other war-torn parts of Syria.
John Reith, commander of the NATO force in Albania, said he wanted to see all refugees moved from the northern border town of Kukes to shelter deeper inside the country.
"We are concerned about the situation at Israel's northern border, " Boucher said, adding the administration had been in touch with the Lebanese and Syrian governments through its U.S. embassies over the weekend.
He may get short shrift: Mr Chertoff said recently that more than a dozen suspected terrorists had been apprehended trying to cross the northern border and that he worried more about Canada than Mexico.
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