which river's source mountain is soutpansberg and it's mouth is olifants river ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_sourceMountain dbr_Soutpansberg sep_dot var_uri dbo_riverMouth dbr_Olifants_River_ attr_open Limpopo attr_close sep_dot var_uri a dbo_River brack_close