Ilha Anchieta

Ilha Anchieta is a state park occupying a small island of roughly 828 hectares in the Bay of Ubatuba along the northern coast of São Paulo state. The island sits approximately 2 kilometers from the mainland port of Ubatuba and is accessible only by boat. Once the site of a federal penitentiary that operated from 1908 to 1955, the island was transferred to São Paulo state management and declared a state park in 1977. Today it attracts visitors for its combination of Atlantic Forest trails, pristine beaches, and the evocative ruins of the former prison complex. The park is managed by the Fundação Florestal and receives significant day-trip tourism from Ubatuba.

Ilha Anchieta supports a notable wildlife community shaped by island biogeography and decades of protection since penitentiary closure. Capybaras, introduced during the prison era, now form a thriving free-ranging population and are one of the island's most recognizable residents. Agoutis, coatis, and various small rodents are common in secondary Atlantic Forest. The island's surrounding waters host spinner dolphins, sea turtles including loggerhead and green turtles, and diverse reef fish communities. Over 100 bird species have been recorded, including the endemic São Paulo tyrannulet and various seabirds such as magnificent frigatebirds and brown boobies. The surrounding marine environment is part of the Ubatuba Environmental Protection Area.

The island is covered predominantly by secondary Atlantic Forest in various stages of regeneration, reflecting over a century of human occupation followed by gradual ecological recovery. Dense coastal Atlantic rainforest, locally called Mata Atlântica, dominates the interior with species including various bromeliads, orchids, ferns, and climbers festooning the forest understory. Coastal restinga vegetation—a distinct scrubby ecosystem adapted to sandy soils and salt spray—fringes much of the shoreline. Native pioneer species including embaúba (Cecropia spp.) colonize clearings, while larger canopy trees including figueiras (Ficus spp.) and caixeta (Tabebuia cassinoides) appear in more mature forest patches. Aquatic seagrass beds and rocky intertidal algae communities extend around the island's perimeter.

Ilha Anchieta is composed primarily of Precambrian crystalline basement rocks belonging to the Serra do Mar geological complex, dominated by granites and gneisses of Neoproterozoic age (roughly 600–700 million years old). These hard, erosion-resistant rocks form the island's rugged topography, with steep granite outcrops rising toward the interior. The island's beaches are formed by wave erosion of the surrounding granitic headlands, producing coarse white sand with high feldspar content. The coastline features numerous rocky promontories, sea caves, and wave-cut platforms that create the complex intertidal habitats supporting diverse marine life. The submarine topography around the island includes rocky reefs at relatively shallow depths.

Ilha Anchieta experiences a hot, humid tropical climate strongly influenced by its coastal and insular location in the northern São Paulo littoral. Annual rainfall averages approximately 1,800–2,200 millimeters, with the wettest period from November through March when orographic effects from the Serra do Mar intensify precipitation. Summer temperatures (December–February) regularly reach 30–35°C with high humidity, while mild winters (June–August) see daytime highs around 22–25°C. Sea breezes moderate temperatures on the island and contribute to the high humidity year-round. Fog is common in winter mornings. Tropical cyclonic disturbances occasionally affect the coast in summer but rarely with severe intensity at this latitude.

Archaeological evidence indicates that the Tupinambá people inhabited the Ubatuba coastline and surrounding islands for centuries before Portuguese colonization in the sixteenth century. The Portuguese established the port of Ubatuba in the 1530s and used the surrounding waters as an important colonial shipping route. Ilha Anchieta itself remained largely uninhabited during the colonial period, used primarily for fishing. The island takes its name from José de Anchieta, the Jesuit missionary who worked extensively along the São Paulo coast in the sixteenth century. In the early twentieth century, federal authorities selected the island as the site for a penitentiary to house political prisoners and common criminals considered dangerous to the mainland population.

The Federal Correctional Colony on Ilha Anchieta operated from 1908 until 1955, when a prison uprising and mass escape prompted its closure. Following closure, the federal government retained the island for several years before transferring jurisdiction to the state of São Paulo. The state declared Ilha Anchieta a state park in 1977 under the São Paulo State Parks System, managed by the Secretaria do Meio Ambiente and later the Fundação Florestal. Conservation efforts initially focused on halting further habitat degradation and allowing Atlantic Forest regeneration. The park gained recognition as part of the Atlantic Forest South-East Reserves UNESCO World Heritage Site inscribed in 1999, which collectively protects critical remnants of the biome across southern Brazil.

The park offers approximately 12 kilometers of marked trails crossing the island's varied terrain, including the popular Trilha das Palmas that traverses secondary Atlantic Forest and connects the main landing dock to interior viewpoints. The former prison ruins are one of the island's most visited sites, including the remains of cell blocks, the warden's house, and administrative buildings now partially reclaimed by vegetation. Sete Praias—a circuit connecting seven beaches along the island's western coast—is a favorite hiking destination, passing stretches of fine white sand and rocky headlands. Praia do Presídio near the former penitentiary dock and Praia da Feiticeira on the southern coast are popular swimming spots. Snorkeling around the rocky reefs is excellent due to high water clarity.

Visitors reach Ilha Anchieta by boat from the port of Ubatuba, with licensed boat services operating regular day trips typically departing in the morning and returning in late afternoon. The crossing takes approximately 20–30 minutes. The park has no overnight accommodation, and camping is not permitted; all visits are day trips. Facilities on the island include basic restrooms near the main landing area, a small visitor information kiosk, and picnic tables. Trail signage is maintained along the main routes. The Fundação Florestal manages visitor numbers to protect the fragile island ecosystem, and access is sometimes restricted during the peak summer season. Entrance fees apply and are collected at the dock.

Ilha Anchieta faces conservation challenges typical of Atlantic Forest remnants in heavily populated coastal areas, including pressure from recreational tourism, management of the introduced capybara population, and control of invasive plant species. The surrounding marine environment benefits from the island's protected status, with no-take fishing zones supporting recovery of reef fish populations. The park participates in São Paulo state conservation monitoring programs and collaborates with the Projeto TAMAR sea turtle conservation initiative active along the Ubatuba coast. The island's inclusion in the Atlantic Forest South-East Reserves World Heritage Site has strengthened international attention and funding for conservation. Ongoing vegetation monitoring tracks Atlantic Forest recovery across the island since penitentiary closure.