Actors Ben Affleck and Jennifer Garner are seen at the Democratic National Convention in Denver, Wednesday, Aug. 27, 2008. (AP Photo/Paul Sancya)
The actor visited the Central African country this week to tour refugee camps and meet with aid officials and experts.
It is his fourth visit since 2007. In May he filmed a documentary on eastern Congo's difficulties for the news show "Nightline."
After doing more research, he says he was shocked to learn about Congo's four-year war, during which an estimated 5 million people died.