\"According to the agreement reached by the heads of Tajikistan, Iran and Afghanistan in Dushanbe, a pipeline will be built running from Iran to Tajikistan through Afghanistan and further to Kyrgyzstan and China,\" Ali Asqar She\'rdoust told Trend News Agency. Referring to the recent joint meeting of the presidents of Iran, Afghanistan and Tajikistan in Dushanbe, the Iranian envoy noted that the sides have been discussing the implementation of projects on the transportation of electricity and water for several years and a document on this issue has been signed following negotiations by the three countries. The three heads of state signed agreements on the establishment of connecting routes and the exchange of oil, gas and water during the fifth trilateral summit of the presidents of the three Persian-speaking countries in Dushanbe on March 25, 2012. Iran, which sits on the world\'s second largest natural gas reserves, is making efforts to boost its gas production by increasing foreign and domestic investments, especially in its South Pars gas field.