Peru is part in another border dispute, this time with Chile.
Peru's Congress has passed a bill to redraw its sea border with Chile, deepening a diplomatic row between the two Latin American nations.
The bill, backed in a 98-0 vote, grants Peru control of 37,900 square km rich fishing waters in the Pacific Ocean.
Chile - which currently controls the area - says the legislation violates treaties signed in the 1950s.
There was a war about the border to Ecuador in 1995, called the Cenepa war.