Isla Martín García

Isla Martín García in the Río de la Plata has served as a prison for four Argentine presidents — Hipólito Yrigoyen, Marcelo T. de Alvear, Juan Perón (briefly), and Arturo Frondizi — and the island's small size (2.5 square kilometres) means that the cell where they were held, the colonial fort that preceded it, and the tango monument that commemorates the island's more musical moments are all within 15 minutes' walk of each other. The Buenos Aires ferry docks here at noon and leaves at 5pm.

Isla Martín García is a river island belonging to Buenos Aires Province, located 3 kilometres from the Uruguayan coast in the Río de la Plata, and has functioned since colonial times as a strategic naval and military position — Spain, England, Brazil, and Argentina have all occupied it. The island's presidential detention history began with Yrigoyen in 1930 and continued intermittently through the twentieth century, and the cells where each president was held are marked and accessible to visitors. The island also hosts a significant muralist tradition — the work of painters who spent time here during various political detentions — and a sculpture park created by Argentine artists in the second half of the twentieth century. The native forest on the island, protected as an ecological reserve since 1986, contains one of the last remaining examples of riverside subtropical gallery forest in the Buenos Aires Province, with a bird species count exceeding 200.