The official name is Monday Falls. The falls of the Monday River are located in the city of Presidente Franco, in Paraguay, next to Foz do Iguaçu (Brazil), and are part of the tourist attractions and preservation area of the Trinacional Region, known as Triple Border, where two rivers (Iguassu and Paraná) and three countries (Argentina, Brazil and Paraguay) meet. The Monday Falls are located on its left bank in a 9-hectare Municipal Park and are protected on the right bank by the 450-hectare Maharishi Private Nature Reserve. The waters that pass through the waterfall with an average flow rate of 100 cubic meters per second drop, without warning, from a height of 40 meters, half the height of the Iguaçu Falls jumps in the Iguaçu/Iguazú National Parks.
The Municipal Park, administered by the private initiative, has structure to receive visitors, with restaurant, bar, bathrooms, parking and an elevator that allows access to the base of the falls. The structure includes viewpoints of the falls that are part of the family of large and small waterfalls of the Terra das Muitas Águas, characterized by the presence of the Atlantic Forest, the black basalt and a rich fauna and flora linked to the environment of the waterfalls.
Visitors to the Monday Falls may explore leisure and activity options. The 450 hectares of the Maharishi Reserve are considered as an important sample of the Upper Paraná Atlantic Forest (BAAP) in the Paraguayan Upper Paraná state and from eastern Paraguay. “Atlantic Forest of Upper Paraná” is how Paraguayans call the Atlantic Forest. The space is home to 59 plant species, 20 orchid species and 277 bird species, seven of which are considered endangered.
Still on the right bank, linked to the Municipal Park, is the Aventura Monday Park, with another seven hectares, offering activities such as rafting, zip lining, arborism and archery. On the opposite side of the Adventure Park is the Maharishi Reserve, which also offers adventure-centered attractions, nature contemplation and views of the Monday Falls. There is a crossing that allows connecting the two attractions.
“Monday” is the name of the river where the waterfalls are located. The word "Monday" has nothing to do with "Monday" in English. "Mondá" means "thief" and "Y" means water in Guarani, Paraguay's official language along with Spanish. "Monday" brings to mind the idea of a "water that disappeared" quickly. This is what happens to someone who has unwittingly sailed the river, believing it will flow calmly to its mouth and suddenly the water disappears, leaving the boat without "ground". Hence, the Guarani attributed to this phenomenon the image of a “stolen water” or something that stole the water, leaving the imagination free to ask: where is the water that was here?
After millions of years of formation and thanks to the patient work of erosion, the Monday Falls are today where they are. Not long ago, geologically speaking, the Monday River flowed straight into the Paraná River, just below the Triple Border Landmark, in the Triple Border region, where two rivers and three countries meet. With the erosion, the waterfalls were formatted where they are today in the Municipal Park Monday, in the city of Presidente Franco, 10 kilometers from the International Friendship Bridge.
After the falls, the Monday River continues its journey for another six kilometers to complete its 170-kilometer trip between the springs in the Caaguazú Range and the mighty Paraná River, one of the seven largest rivers in the world. The Monday Falls is the Paraguayan contribution to the large waterfalls in the Triple Border region. The average Monday River flow rate in the waterfalls is around 100 cubic meters per second. It may seem little compared to the 1,500 m3 per second of the Iguaçu River at the Iguazu Falls. However, not that little when one remembers that the flow of the Monday river at the falls is at least twice greater than the flow of the Iguaçu River in Porto Amazonas, in Curitiba Metropolitan Region, where the river begins to be navigable and has a flow between 40% and 50% meters cubic per second.
Thus, the flow of the Monday Falls corresponds on average to about 7% of the average flow of the Iguazu Falls. The Monday Falls share with the Iguazu Falls the same geological age, the same geological formation and the same vegetation around it, the large forest as well as those born in the rocks on the cliff walls, and even the same birds, the taperuçu of waterfalls (Cypseloides senex), which live, build nests and make magnificent flutters amidst the mists of the Monday Falls. Visitors of the Monday Falls are also welcomed with one or more rainbows, depending on the sun rays' encounter with water droplets suspended in the environment, just as it happens with its more famous sister in the Iguassu river.