Pilcomayo
geographical name
Pil·co·ma·yo
ˌpēl-kō-ˈmä-yō 
river 1000 miles (1609 kilometers) long in south central South America rising in Bolivia and flowing southeast on the Argentina–Paraguay boundary into the Paraguay River
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“Pilcomayo.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Pilcomayo. Accessed 30 Oct. 2025.
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