Iran shares land borders with seven neighboring countries: Iraq and Turkey to the west, Armenia, Azerbaijan, and Turkmenistan to the north, and Afghanistan and Pakistan to the east. These land frontiers stretch roughly 5,894 kilometres in total, while Iran's coastline along the Caspian Sea, the Persian Gulf, and the Gulf of Oman adds maritime neighbors on top of its terrestrial ones.
Iran's Western Neighbors: Iraq and Turkey
To the west, Iran meets Iraq along a border of roughly 1,599 kilometres, one of the longest and most historically charged frontiers in the region. The two countries are divided in part by the Zagros Mountains and the Shatt al-Arab waterway near the Persian Gulf. This boundary was the front line of the Iran-Iraq War (1980-1988), and today it remains a major route for religious pilgrimage, as millions of Iranians travel to the Shia holy cities of Najaf and Karbala in Iraq.
Further north, Iran borders Turkey for about 534 kilometres. This is a mountainous frontier dominated by Mount Ararat on the Turkish side. The Bazargan-Gurbulak crossing is one of the busiest land gateways between the Middle East and Europe, carrying both freight and travellers along an overland trade corridor that has functioned for centuries.
The Northern Frontier: Armenia, Azerbaijan, and Turkmenistan
Iran's northern edge touches three former Soviet republics. Armenia shares the shortest of all Iran's land borders, just about 35 kilometres, running along the Aras (Araxes) River. Despite its small size, this border is strategically vital, giving landlocked Armenia an alternative outlet to the south and supporting close energy and trade cooperation between the two states.
Azerbaijan borders Iran in two separate stretches totalling around 689 kilometres, because the Azerbaijani exclave of Nakhchivan is cut off from the rest of the country. Both segments largely follow the Aras River. Turkmenistan shares Iran's longest border, approximately 992 kilometres, sweeping across the Kopet Dag mountain range and the arid plains south of the Karakum Desert. The two countries cooperate closely on natural gas pipelines and rail links connecting Central Asia to the Persian Gulf.
The Eastern Borders: Afghanistan and Pakistan
To the east, Iran faces Afghanistan along a border of roughly 921 kilometres, much of it crossing dry, sparsely populated terrain in the provinces of Khorasan and Sistan-Baluchestan. Water rights over the Helmand River have long been a point of negotiation, and the border has also been a major route for refugees and trade.
Continuing south, Iran borders Pakistan for about 909 kilometres across the rugged Balochistan region. This remote desert and mountain frontier is shared by ethnic Baloch communities on both sides. A railway and the Mirjaveh-Taftan crossing link the two nations, and energy projects such as proposed gas pipelines have featured prominently in their bilateral relationship.
Maritime Neighbors and Strategic Waters
Beyond its land borders, Iran has extensive coastlines that create maritime boundaries with several Gulf states. Across the Persian Gulf and the Strait of Hormuz, Iran's sea neighbors include Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the United Arab Emirates. The Strait of Hormuz, only about 33 kilometres wide at its narrowest, is one of the world's most important oil-shipping chokepoints, making these maritime relationships geopolitically significant. To the north, Iran also borders the landlocked Caspian Sea, which it shares with Russia, Kazakhstan, Azerbaijan, and Turkmenistan.
Why Iran's Borders Matter
Few countries connect so many distinct regions. Iran links the Arab Middle East, the Caucasus, Central Asia, and South Asia, sitting at the crossroads of ancient trade routes including the Silk Road. Its borders are defined by dramatic natural features, the Zagros and Alborz mountain ranges, the Aras River, and vast deserts, which have historically shaped where lines were drawn through treaties and conflicts. To explore Iran in greater depth, see our iran country guide.
Frequently Asked Questions
How many countries border Iran?
Iran shares land borders with seven countries: Afghanistan, Armenia, Azerbaijan, Iraq, Pakistan, Turkey, and Turkmenistan. It also has maritime neighbors across the Persian Gulf and the Caspian Sea.
Which country shares the longest border with Iran?
Turkmenistan shares Iran's longest land border, stretching approximately 992 kilometres along the Kopet Dag mountains in the northeast.
Which country has the shortest border with Iran?
Armenia shares the shortest border with Iran, only about 35 kilometres, following the Aras River in the northwest.
Does Iran border any seas?
Yes. Iran borders the Caspian Sea to the north and the Persian Gulf and Gulf of Oman to the south, giving it maritime boundaries with Gulf states and Caspian littoral nations.
