The Rio Paraguay is a major river in South America, flowing through Brazil, Paraguay, and Argentina. It spans approximately 2,621 kilometers (1,629 miles) and serves as a natural border between Paraguay and Argentina. The river is an important waterway for transportation and trade in the region. The Rio Paraguay is part of the larger Paraguay River system, which eventually connects to the Paraná River. It supports diverse ecosystems and is home to various species of fish and wildlife. The river also plays a crucial role in the local economy, providing resources for fishing and agriculture.