Paul Udoto, spokesman for the Kenya Wildlife Service, said those who died in the Sunday evening tragedy were five Kenyans of Indian descent, an Indian national and their Kenyan driver.
Six of the bodies have been recovered, Mr Udoto said on Monday.
Seven years ago, seven members of a church group died when they were washed away by floods in the same area, which is prone to flash floods during the rainy season.
Authorities say that while it may not be raining in the gorges, rainfall from surrounding areas builds up and can rush through the restricted space.
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