Anhatomirim Island (indian name) located on Baia Norte (North Bay) next to the mainland and is nowadays part of the Governador Celso Ramos Municipality.

It's strategic position - in the entrance of Baia Norte - was responsible for Santa Cruz Fort construction that, in the 18th century, was the third vertex of a triangular defense system, formed by São José da Ponta Grossa Fort and Santo Antônio de Ratones Fort. This system should protect the northern coast of Santa Catarina Island against the foreigners, mostly from Spain, and consolidate the Portuguese occupation of the south of Brazil.

In 1894, during the Federalist Revolution, this Island was used as a prision and a base for shooting people against the government of Floriano Peixoto (in Santa Cruz Fort). In 1907, it belonged to the Navy Ministry and it resumed as a prison at the end of the Constitucionalist Revolution, in 1932. It worked as a Fort until the end of the World War II, when the new warlike technology made it obsolete as a military unit and then it was closed.

In the south of the island there is a small beach and a wharf for disembarkation.

The access to the island is possible through the schooners service, which leave from different places in Florianópolis - mainly from Canasvieiras wharf, Beira Mar wharf and under Hercilio Luz Bridge. You can also reach the island in "baleeiras" (typical fishing boat propelled by a centrally positioned engine)from these beaches: Jurerê, Canasvieiras, Daniela and Fort Beach, located in the north of Florianópolis and, also, from Antenor Beach (in the mainland).