These are the largest remaining unengaged people groups in the world. They’re different from the 6,500 unreached people groups because these 516 not only have no access to the gospel, but there are currently no efforts to bring them Christ. No one is working among them or trying to plant churches among them, they are completely unengaged from the love of Christ.
This is the same list as seen on the Wall of Unengaged People at ICOM 2015 in Richmond, VA.