Topo Islet () is a vegetated uninhabited islet just off the extreme southeastern tip of the island of São Jorge in the Portugal archipelago of the Azores.
Waters around the islet range from deep. The area is suitable for more experienced scuba diving due to strong currents. Though the islet is just off the coast, most diving expeditions leave from the port of Velas, about 75 minutes away by boat.
The islet has no permanent human population or structures. However, prior to Topo Islet's local protection as a nature reserve, people visited the islet and its waters to camping and spearfishing.
In 2011 the original Topo Islet reserve and adjacent coastline was named Área Protegida para a Gestão de Habitats ou Espécies do Ilhéu do Topo (Topo Islet Protected Area for Habitat and Species Restoration) and integrated into the newly established Nature Park of São Jorge, one of the locally protected areas of the Azores. The entire terrestrial area of the islet is protected.
As sheep and cattle pasture on the islet—damaging the natural habitat—its plant diversity is low. However, researchers have found exemplars of the endemic Azorean bracel-da-rocha fescue grass ( Festuca petraea) on Topo Islet.
The waters around Topo Islet are biodiversity. Fish observed in the area include Atlantic bonito, Chromis limbata, barred hogfish, bluefish, Canary damsel, dusky grouper, longfin yellowtail, Mediterranean rainbow wrasse, of various species, ornate wrasse, white trevally, and yellowmouth barracuda. The common octopus also habitates the area.
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