大峡谷的主体部分来自非洲,延伸自红海穿过埃塞俄比亚,横跨两岸的肯尼亚、坦桑尼亚、马拉维到莫桑比克的赞比西河流域下游. 埃塞俄比亚的许多湖泊和几个狭长的小湖泊,尤其是图尔卡纳湖和尼亚萨湖. 刚好尼亚萨湖的有一个西部分流向北流,主要沿着刚果的东部边界(金沙萨);这条分支连接了许多湖泊包括了坦噶尼喀湖、基伍湖、爱德华湖、艾伯特湖(蒙博托).
Lake Victoria does not lie in the Great Rift Valley but between its main and western branches. The Great Rift Valley ranges in elevation from 1,300 ft (395 m) below sea level (the Dead Sea) to 6,000 ft (1,830 m) above sea level in S Kenya. Erosion has concealed some sections, but in places, notably in Kenya, there are sheer cliffs several thousand feet high. The present configuration of the rift, which dates from the mid-Pleistocene epoch, is probably a result of a rifting process associated with thermal currents in the earth's mantle elongated depression, trough, or graben in the earth's crust, bounded on both sides by normal faults and occurring on the continents or under the oceans. The central flat block forming the trough slips downward relative to the crustal blocks on either side. The appearance is that of a fallen keystone in a broken arch. There is evidence of earlier rift structures.
维多利亚湖不列于大裂谷,但是位于大裂谷主要的山脉及西部分支。大裂谷的范围从海拔从海面以下(死海)1300英尺(395米)到海平面以上6000英尺(1830米)肯尼亚南部的海平面. 部分区域的腐蚀被隐藏起来,但在有些地方,特别是在肯尼亚,有数千英尺高的悬崖. 目前的断裂结构,显示来自中世纪,也许是由于断裂的过程中与热气流在地球地幔被低压延伸到地壳地堑中,位于断层的两侧正常断裂并且断裂发在陆地或者海洋.中心的平地阻止了滑槽向地壳的两边下降. 外貌看起来是由倒下的拱形石破裂成拱形.这显示了早期的裂痕结构.
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