<prompt> Translate the following text to EnglishHawakutaka kusafiri juu ya mto kwa sababu mifereji kadhaa ya maporomoko ya maji ilizuia njia na hawakujua kwamba maji yalianzia katikati ya Afrika.  <response>: They could not travel upriver because several sets of cataracts blocked passage and they did not know that the waters traveled from the heartland of Africa. 