The cause: a dispute over which country should control a Buddhist temple after France decades ago demarked the border between the countries.
There are no pressing border security issues between the countries, which share a remote desert border along northeastern Jordan and western Iraq's Anbar province.
In June, they opened the border between the two countries for the first time since 1980.
Greek and Turkish soldiers exchanged gunfire on the border between the two countries.
Afghan and Pakistani troops have clashed across the border between the two countries for the second time in a week.
The disputed region is on the border between the two countries created last year when South Sudan split from Sudan.
CNN: South Sudan says it is withdrawing from disputed oil region
After a decade of negotiations, Estonia and Russia signed a treaty defining the border between the two countries in May 2005.
Preliminary talks have been held about a direct road link to China across the remote 76-kilometer (47-mile) border between the two countries, according to Afghanistan's Foreign Ministry.
Welcoming the resumption of the high-level dialogue between the Governments of Sudan and Chad, as well as their singing of the Accord on Normalization of Relations, the Secretary-General underlines the importance of translating the normalization of diplomatic relations into increased security on the ground, particularly along the common border between the two countries.
Before the summit, India had floated the idea of opening extra border crossings between the two countries, and optimists had speculated about an agreement to build an oil pipeline from Iran to India, through Pakistan.
Yet there is another, more obvious bone of contention, which exacerbates all these others and lies at the root of them: the 4, 000km border that runs between the two countries.
The Canadian-American border, the longest border in the world between two countries, is as willful an act of imagination as a work of conceptual curtaining by Christo, but its existence has made two separate peoples, with two separate stories.
Indian foreign policy elites defend this unprincipled policy by pointing to cooperation between the Indian and Burmese militaries on their restive common border, and the growth in trade between the two countries.
And business between the two countries, despite their closed border, is growing daily, via Georgia.
Relations between the two countries are strained following a border dispute, which makes dealing with common problems difficult.
The historic 1979 peace treaty between the two countries, which share a long border, is the cornerstone of a regional balance.
Lashio, about 100 miles from the China border, is seen as a key point for trade between the two countries.
In 2008 and 2011, Thailand and Cambodia fought brief border wars that claimed scores of lives and strained relations between the two countries.
In recent years, as trade between the countries has boomed, they have attempted to smooth over regular border disputes.
WSJ: Border Dispute Overshadows Chinese Premier Li's Visit to India
No flights operate between the two capitals and citizens of both countries require visas to cross the border.
Between the Black Sea and the Chinese border, more than 70m people live in eight countries that did not exist in that form a decade ago.
If an outbreak occurred in a border region, for example, a swift response would most likely depend on prior agreements between different countries about quarantine and containment.
Last week, tensions between the two countries escalated again with reports that Pakistan had redeployed troops on its eastern border with India.
Considering the trading markets for currencies themselves, the dollar figures in 90 percent of those transactions, nearly 70 percent of global central bank holdings are denominated in dollars, and with cross border trade in mind for individuals in countries with thinly traded currencies, the dollar is the go-between currency of choice 90 percent of the time.
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