 Costa Rica has a long-term disagreement with Nicaragua over the San Juan River, which defines the border between the two countries, and Costa Rica's rights of navigation on the river.In 2010, there was also a dispute around Isla Calero, and the impact of Nicaraguan dredging of the river in that area.On 14 July 2009, the International Court of Justice in the Hague upheld Costa Rica's navigation rights for commercial purposes to subsistence fishing on their side of the river.