Several agreements in different fields were signed between Iran and Tajikistan amid Iranian President's visit to the Central Asian state, Fars News reported.
During a ceremony attended by President Ahmadinejad and his Tajik counterpart Emomali Rahmon in Dushanbe on Monday, the two countries signed five Memoranda of Understanding (MoUs) and issued a joint statement.
The MoUs involve cooperation on completing construction of Esteqlal tunnel in Tajikistan, building a dam and a hydroelectric power plant in the Central Asian country.
Cooperation on extradition of criminals and geology were also agreed by Tehran and Dushanbe.
The Iranian president, heading a high-ranking politico-economic delegation, arrived in Dushanbe on Monday on the first leg of his Central Asian tour.
Tajik Prime Minister Oqil Oqilov as well as the country's Foreign Minister, Hamrokhon Zarifi, and a number of Tajik officials welcomed the Iranian president at the airport.
He was later officially welcomed by his Tajik counterpart Emomali Rahmon.
Immediately after the welcoming ceremony, the two presidents started their private talks.
Later on Monday, Ahmadinejad will leave Dushanbe for Ashgabat, Turkmenistan, which is the second destination of President Ahmadinejad's two-nation tour to the Central Asia.