Q. Madeira River, recently seen in the news, forms the border between which two South American countries?
Answer: Bolivia and Brazil
Notes: Residents near the Madeira River in the Amazon face severe challenges due to historically low water levels amid a severe drought. The Madeira River is a major tributary of the Amazon River, formed by the Mamoré and Beni rivers in Bolivia, flowing northward. It forms a 100 km border between Bolivia and Brazil and is part of the 1.3 million square kilometer Madeira Basin. The basin spans Bolivia, Brazil, and Peru, with 50% in Bolivia, 40% in Brazil, and 10% in Peru. The river plays a vital role in the Amazon Basin's hydrology, supporting diverse ecosystems.