Iran has several major nuclear program sites, now the subject of negotiations with the US

DUBAI, United Arab Emirates — Iran has multiple major sites associated with its rapidly advancing nuclear program, now the subject of several rounds of negotiations with the United States.

The sites across the country, including one in the heart of Tehran, the capital, show the breadth and history of the program. One in particular, Iran's Natanz enrichment site, has been targeted several times in suspected sabotage attacks by Israel amid tensions between the two Mideast rivals.

Here's a look at some of those major Iranian sites and their importance in Tehran's program.

Natanz enrichment facility

Iran's nuclear facility at Natanz, located some 220 kilometers (135 miles) southeast of Tehran, is the country's main enrichment site. Part of the facility on Iran's Central Plateau is underground to defend against potential airstrikes. It operates multiple cascades, or groups of centrifuges working together to more quickly enrich uranium. Iran also is burrowing into the Kūh-e Kolang Gaz Lā, or ''Pickaxe Mountain,'' which is just beyond Natanz's southern fencing. Natanz has been targeted by the Stuxnet virus, believed to be an Israeli and American creation, which destroyed Iranian centrifuges. Two separate sabotage attacks, attributed to Israel, also have struck the facility.

Fordo enrichment facility

Iran's nuclear facility at Fordo is located some 100 kilometers (60 miles) southwest of Tehran. It also hosts centrifuge cascades, but isn't as big a facility as Natanz. Buried under a mountain and protected by anti-aircraft batteries, Fordo appears designed to withstand airstrikes. Its construction began at least in 2007, according to the International Atomic Energy Agency, although Iran only informed the U.N. nuclear watchdog about the facility in 2009 after the U.S. and allied Western intelligence agencies became aware of its existence.

Bushehr nuclear power plant

Iran's only commercial nuclear power plant is in Bushehr on the Persian Gulf, some 750 kilometers (465 miles) south of Tehran. Construction on the plant began under Iran's Shah Mohammad Reza Pahlavi in the mid-1970s. After the 1979 Islamic Revolution, the plant was repeatedly targeted in the Iran-Iraq war. Russia later completed construction of the facility. Iran is building two other reactors like it at the site. Bushehr is fueled by uranium produced in Russia, not Iran, and is monitored by the United Nations' International Atomic Energy Agency.

Arak heavy water reactor

The Arak heavy water reactor is 250 kilometers (155 miles) southwest of Tehran. Heavy water helps cool nuclear reactors, but it produces plutonium as a byproduct that can potentially be used in nuclear weapons. That would provide Iran another path to the bomb beyond enriched uranium, should it choose to pursue the weapon. Iran had agreed under its 2015 nuclear deal with world powers to redesign the facility to relieve proliferation concerns.

Isfahan Nuclear Technology Center

The facility in Isfahan, some 350 kilometers (215 miles) southeast of Tehran, employs thousands of nuclear scientists. It also is home to three Chinese research reactors and laboratories associated with the country's atomic program.

Tehran Research Reactor

The Tehran Research Reactor is at the headquarters of the Atomic Energy Organization of Iran, the civilian body overseeing the country's atomic program. The U.S. actually provided Iran the reactor in 1967 as part of America's ''Atoms for Peace'' program during the Cold War. It initially required highly enriched uranium but was later retrofitted to use low-enriched uranium over proliferation concerns. ___

The Associated Press receives support for nuclear security coverage from the Carnegie Corporation of New York and Outrider Foundation. The AP is solely responsible for all content.

___

Additional AP coverage of the nuclear landscape: https://apnews.com/projects/the-new-nuclear-landscape/