地球北纬30°线,堪称地球上的神秘之线。从地理布局大致看来,这里既有地球山脉的最高峰珠穆朗玛峰,又有海底最深处马里亚纳海沟。世界几大河流——埃及的尼罗河、伊拉克的幼发拉底河、中国的长江、美国的密西西比河,都是在这一 Earth 30 degrees north latitude line, called the mysterious line of the Earth. From the geographical layout of the general view, where there is the highest peak of the Earth Mount Everest, there are the deepest Mariana Trench sea. The world's major rivers - the Nile in Egypt, the Euphrates in Iraq, the Yangtze River in China, the Mississippi in the United States, are in this