AquaRio, Public aquarium in Gamboa, Rio de Janeiro, Brazil.

AquaRio is a public aquarium in Gamboa, Rio de Janeiro, occupying a five-floor building with 28 tanks holding 4.5 million litres of saltwater. Its largest tank, seen from the entrance, has a thick transparent panel set in a dark frame, a pale sandy bottom and a tall grey rock formation on the left, with small fish swimming near the glass. The building formerly belonged to Cibrazem, now CONAB.

AquaRio opened on 31 October 2016 in a ceremony attended by then tourism minister Marx Beltrão. It occupies a former Companhia Brasileira de Armazenamento (Cibrazem) building, now CONAB, and was built within Porto Maravilha, the urban operation to revitalize Rio de Janeiro's port zone. On 31 May 2016 its solar roof, about two thousand panels over six thousand square metres, was inaugurated.

The aquarium's name combines "aqua" and "Rio". Its Great Ocean Tank has a tunnel used for the paid "Sleeping in AquaRio" overnight programme, and visitors can also create a virtual fish at the start of the tour and follow it through the circuit. A Science Museum with a Plankton Station and Shell Exhibition and a Surf Museum assembled by surfer Rico de Souza sit alongside the tanks.

Weekdays are less crowded than weekends, making it easier to observe the animals and move through the exhibits. Plan to spend at least two to three hours to comfortably explore all the different areas.

The Great Ocean Tank holds 4.5 million litres of saltwater, and a tunnel runs through its middle. Visitors can spend a night there through the "Sleeping in AquaRio" programme, or dive in the tank on a separate paid activity. The building once belonged to Cibrazem, now CONAB.