The 10/40 Window lies between 10 degrees north and 40 degrees north latitude covering the areas of North Africa, the Middle East and Asia. Majority of the people groups in the 10/40 Window are Muslim, Hindu or Buddhist. This region includes around more than 60 least-reached countries where most people have not had an opportunity to hear the gospel, meaning that they do not have any access. There are nearly 4 billion people living here, including 90 percent of the world’s poorest of the poor. It is estimated that 61% of this population and around 6000 people groups have never had the chance to hear the Gospel of Jesus Christ.

And this gospel of the kingdom will be preached in the whole world as a testimony to all nations, and then the end will come.
Matthew 24:14