which river ends at elk creek and elk creek ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_riverMouth dbr_Elk_Creek_ attr_open Umpqua_River attr_close sep_dot var_uri dbo_riverMouth dbr_Elk_Creek_ attr_open Umpqua_River attr_close sep_dot var_uri a dbo_River brack_close