What is the 10/40 window?
The 10-40 window refers to that part of the world that lies between the 10th and 40th parallels north of the equator and between the Atlantic Ocean in the West and the Pacific Ocean in the East. 97 percent of the world’s peoples who have never been evangelized – 97 percent of all the cultures that have no indigenous church in their midst – may be found in that region.