亞馬遜之窗是位於南美洲的矩形地帶，大約在赤道以北5度到赤道以南40度，西經80度到50度之間。它涵蓋12個國家和1個獨立領土，包括阿根廷，玻利維亞，巴西，智利，哥倫比亞，厄瓜多爾，圭亞那，巴拉圭，秘魯，蘇里南，烏拉圭，委內瑞拉和法屬圭亞那。這個區域涵蓋了充滿熱帶雨林的亞馬遜河，但更重要的是，許多從未聽聞福音的部落民族定居在此，他們不曾聽聞福音，因為很少有人能夠到達這些地方。儘管在亞馬遜之窗僅有不到100個未觸之民族，但他們卻是那長久被遺忘的失落民族。在這些民族中，許多民族從未與外界聯絡，甚至有些民族的存在與否尚屬未知，他們就像耶穌撇下九十九隻羊，轉而去尋找的那隻迷失的羊。
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.
