The Amazon Window is the rectangular area of South America approximately between 5 degrees north of the equator to 40 degrees south of the equator and between 80 and 50 degrees west longitude. It covers 12 countries and 1 independent territory, including Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela, and French Guiana. This area covers the Amazon river, full of tropical rainforests, but more importantly, it houses the tribal people groups who have never had the chance to hear the gospel because very few people can reach those areas. Even though less than 100 unreached people groups are in the Amazon Window, but they have often been forgotten. Among these people groups, many have never been contacted at all, some exist but are still unknown. These are like the one lost sheep that Jesus left the ninety-nine sheep for.