Gruta do Janelão

Gruta do Janelo is a limestone cave in Minas Gerais, Brazil, that is part of the Cavernas do Peruaçu National Park. It is located in the town of Januária. This cave is the largest in the valley, with a horizontal extension of 4,740 meters and a height of 176 meters. Because the grotto has multiple skylights that let the sun in, miniature forests resembling Japanese gardens in terms of delicacy and harmony spring up all along the Peruaçu River, which runs through the Janelo grotto. It already contains the world's longest stalactite, spanning 28 meters in length.

The left bank of the Rio Sao Francisco in Minas Gerais shows a set of caves and archaeological sites with cave paintings scattered on a ten-foot wall wnd its first two of many skylights that would spread over the next 3.5 kilometers of the path with interesting stalagmite and stalactite formations appearing along the way, with the largest stalagmite ever recorded measuring 28 meters long.

The Peruaçu River runs through the cave's interior and is a popular tourist attraction. Outside the cave, the environment is rich, with trees reaching heights of up to 60 meters.

Location: inside the Cavernas do Peruaçu National Park