which river's source mountain is pocahontas county and it's mouth is new river ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_sourceMountain dbr_Pocahontas_County,_West_Virginia sep_dot var_uri dbo_riverMouth dbr_New_River_ attr_open Kanawha_River attr_close sep_dot var_uri a dbo_River brack_close