The Monday River
The Monday River is a Paraguayan river. It runs south of the Triple Frontier's tri-border mark point and drains into the Parana River. Its main course is almost entirely in the Department of Alto Parana. The river where the waterfalls are located is called "Monday."
The term "Monday" has nothing to do with the English word "Monday." In Guarani, Paraguay's official language alongside Spanish, "Mondá" means "thief" and "Y" means "water." The word "Monday" conjures up images of "fast disappearing water."
This is what occurs when someone foolishly sails the river, expecting it would flow gently to its mouth, only for the water to vanish, leaving the boat without "ground." As a result, the Guarani ascribed this occurrence to the notion of "taken water" or someone stealing the water, leading the mind to wonder: where is the water that was here? In the Triple Border area, where two rivers and three countries meet, the Monday River flowed directly into the Paraná River not long ago, right below the Triple Border Landmark. This is considered one of the longest rivers in Paraguay.
Length: 170 km