Monday River
The Monday 'River' is a river of Paraguay. It flows and empties into the Parana River, just south of the tri-border mark point of the Triple Frontier. Its primary course lies almost entirely within the Alto [Parana Department].
Although the river's name is spelled the same as the English name of a day of the week, the river's name is pronounced "mon-da-ugh" and means "robbed river" in the indigenous Guarani language.