Most of the people groups still unreached by the gospel live in places stretching across the maps of northern Africa and Asia. Christian missions strategist Luis Bush started calling this rectangular area or band The 10/40 Window. He used that easy-to-remember name because it describes that area of Africa and Asia from 10 degrees north of the equator to 40 degrees latitude north of the equator. Statistics about this area:

• 2/3 of the unreached population live in this area
• 86% of severe persecution occurs in this area
• 97% of the unreached people live in The 10/40 Window
• Only 5% missions giving goes to countries in The 10/40 Window
• Over 70% of Fellowship Tract League tracts go to countries in The 10/40 Window

The 10/40 Window encompasses Afghanistan, Algeria, Bahrain, Bangladesh, Benin, Bhutan, Burkina Faso, Cambodia, Chad, China, Cyprus, Djibouti, Egypt, Eritrea, Ethiopia, Gambia, Gibraltar, Greece, Guinea, Guinea-Bissau, India, Iran, Iraq, Israel, Japan, Jordan, Kuwait, Laos, Lebanon, Libya, Macau, Mali, Malta, Mauritania, Morocco, Myanmar, Nepal, Niger, North Korea, Oman, Pakistan, Philippines, Portugal, Qatar, Saudi Arabia, Senegal, South Korea, Sudan, Syria, Taiwan, Tajikistan, Thailand, Tunisia, Turkey, Turkmenistan, United Arab Emirates, Vietnam, Western Sahara, and Yemen.