Timoteo Domínguez Island () is the Uruguayan name of an island off the

Río de la Plata The Río de la Plata (; ), also called the River Plate or La Plata River in English, is the estuary formed by the confluence of the Uruguay River and the Paraná River at Punta Gorda, Colonia, Punta Gorda. It empties into the Atlantic Ocean and ...

coast of

Uruguay Uruguay, officially the Oriental Republic of Uruguay, is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast, while bordering the Río de la Plata to the south and the A ...

. It contains the country's only land border with

Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...

Land border

The Argentine

exclave An enclave is a territory that is entirely surrounded by the territory of only one other state or entity. An enclave can be an independent territory or part of a larger one. Enclaves may also exist within territorial waters. ''Enclave'' is s ...

Martín García Island Martín García Island () is the southern half of an island in the Río de la Plata. Martín García is in Uruguayan waters and was disputed between Argentina and Uruguay, but in 1973 they reached an agreement establishing it as Argentine terri ...

is within the boundaries of Uruguayan waters since 1973, when both countries signed the Río de la Plata Treaty establishing Martín García as an Argentine territory to be exclusively used as a nature reserve. In 1961, river sediments gave birth to a small sand bank north of the island, within Uruguay's sovereignty, but as it naturally grew it formed into an island. Finally, in the 1980's, it merged with Martin García creating the very first land border between Uruguay and Argentina.Agreements and differences between Argentina and Uruguay
.

References

River islands of Uruguay Islands of the Río de la Plata Argentina–Uruguay border International islands {{island-stub