name the river passing through foz do iguaçu and has mouth place at foz do iguaçu ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_city dbr_Foz_do_Iguaçu sep_dot var_uri dbo_mouthPlace dbr_Foz_do_Iguaçu sep_dot var_uri a dbo_River brack_close