Argentina lodged a complaint before the International Court of Justice (ICJ) in 2006, arguing that Uruguay had broken the terms of a 1975 treaty regulating the use of the River Uruguay which forms the border between them.

BBC: Paper mill in Uruguay - file photo

In May the International Court of Justice (ICJ), based in The Hague, began deliberating on a case between Colombia and Nicaragua over a piece of the Caribbean.

ECONOMIST: How to solve spats over sea borders