Bolivian President Evo Morales is in Tehran for talks with Iranian leaders on energy, investments and bilateral relations.
Mr. Morales arrived in the Iranian capital Monday at the head of a high-level Bolivian delegation. He is expected to meet with his Iranian counterpart, Mahmoud Ahmadinejad.
During a visit to Bolivia last year, Mr. Ahmadinejad pledged more than $1 billion in investments to help develop Bolivia's oil and gas industry.
Bolivia has the second largest natural gas reserves in South America after Venezuela.
Mr. Morales' trip to Iran follows a visit to Libya, where he met with senior Libyan officials Sunday for talks on reinforcing newly establised diplomatic relations.
The governments of Libya and Bolivia agreed to establish formal ties and cooperate in the energy sector during talks in Bolivia last month.
The two nations are expected to work together to develop Bolivia's natural gas and oil resources, which are mainly in the country's east.
Some information for this report was provided by AFP, AP and Reuters.