Geography Piauí is bounded on the west by LOCATION@1 , on the east by LOCATION@2 , LOCATION@3 and LOCATION@4 , and on the south by LOCATION@5 .

Geography Piauí shares borders with the states of LOCATION@1 -LRB- west -RRB- , LOCATION@2 -LRB- east -RRB- , LOCATION@3 -LRB- east -RRB- and LOCATION@4 -LRB- east and south -RRB- .
