The annual APEC economic leaders' summit was set to kick start later in the day, involving the leaders of 20 other major economies in the Asia-Pacific region that include the United States and Japan.
Da Nang is the second leg of his three-nation trip that began Wednesday, one day after he hosted U.S. President Donald Trump for a bilateral summit in Seoul.
At the APEC summit, Moon will likely seek support for his country's efforts to denuclearize North Korea, which staged its latest and most powerful nuclear test so far on Sept. 3.
Moon has insisted only the strongest pressure and sanctions against the communist state will force the North to give up its nuclear ambition.
He was widely expected to call for China's support when he meets his Chinese counterpart here. The leaders have agreed to hold a bilateral summit on the sidelines of the APEC forum, scheduled to end Saturday. China is the North's largest communist ally, and is said to account for more than 90 percent of the North's overall trade.
The South Korean leader will also hold a series of bilateral talks with other global leaders before he heads to Manila on Sunday for the East Asia Summit and an annual regional forum involving the 10-member Association of Southeast Asian Nations and the leaders of South Korea, Japan and China.
He will return home on Wednesday. (Yonhap)