Have they all heard the good news yet?

There are isolated villages along the Congo River and its tributaries that have NOT heard the Gospel of Good News preached to them! Yes, they have heard about Jesus, but have not been evangelized, baptized and taught everything that Jesus had commanded! They have no congregations and no encouragement nor any Epistles of Paul to guide their new Christian conduct. How can they hear if no one is sent? When will you send me? https://www.youtube.com/watch?v=zAgwz8Bubes