Sarstoon River

The Sarstoon River is a Central American river that forms part of the international border between Belize and Guatemala.
The source of the 111-kilometer-long river lies in Guatemala's Alta [Verapaz Department|Alta Verapaz] Department. It flows eastward, serving as the border between the departments of Petén and Izabal before passing between Belize's Toledo District and Guatemala's Izabal Department on its way to the Caribbean Sea. Near its mouth lies Sarstoon Island, in Belizean territory.
The Sarstoon is the internationally accepted southern border between Belize and Guatemala, although as part of the Belizean–Guatemalan [territorial dispute] since 1999 Guatemala has claimed Belizean territory south of the Sibun River.
On 15 April 2019, the river was the site of a border incident between Guatemala and Belize, when three Guatemalan gun-boats crewed by armed soldiers prevented the Belizean coast guard from patrolling the river.