Islamabad hosted the day-long 10-nation Economic Cooperation Organization summit that finalized a "Vision 2025" plan for expanding trade and prosperity among member nations.
"There has never been a more opportune time to realize our dreams of connectivity for regional prosperity," said Pakistani Prime Minister Nawaz Sharif, who was elected new chairman of the organization. "We can and should achieve even more by pooling together our individual efforts for greater synergy."
Iranian President Hassan Rouhani and Turkish President Recep Tayyip Erdogan are among the heads of states who attended the summit.
Turkey, Iran and Pakistan founded ECO in 1985. Afghanistan's ambassador to Pakistan, Omar Zakhilwal, who represented Kabul, said that peace and stability in the region will play a greater role in achieving mutual economic goals.
"We can meet the challenges of poverty by implementing a joint strategy," Zakhiwal said.
Sharif, in televised remarks at the end of the summit, expressed the member nations' resolve to fight terrorism and extremism collectively.
"We are determined to collectively face challenges such as extremism, terrorism and drug trafficking in order to realize our vision of making the region a zone of peace and prosperity," he said. "We have committed ourselves to working together for bringing progressive change to the lives of the people in our region, transforming it into a bastion of peace, progress and prosperity."
The participants also adopted an "Islamabad Declaration" on improving trade. Earlier, heads of member states "underscored the need for expansion of cooperation in various fields under the framework of ECO," according to a foreign ministry statement.
The statement said the participants reached an understanding to "transform the ECO region into a zone of peace and collective prosperity."
The conference took place under tight security after a wave of recent suicide bombings by various militant groups killed more than 125 people across Pakistan. Pakistan's decades-long war with local Taliban, al-Qaida-linked militants and other Islamic extremists has killed tens of thousands of people.
All roads leading to the venue in Islamabad were blocked and all offices, schools and most businesses in the capital were closed on Wednesday.
Islamabad also used the summit as a chance to show its potential as one of Asia's emerging markets. "Our economic indicators are up," Sharif told the meeting.
Government officials have also described the summit as an opportunity to show that Pakistan cannot be isolated from the international scene. Last year, a key regional cooperation conference was cancelled after neighboring India and Afghanistan refused to attend; both nations blame Pakistani-based militants for carrying out attacks in their countries, and tensions with India have been high over cross-border violence in the disputed Kashmir region.
The heads of member states left Islamabad after the summit.