Retrieving "Madeira River" from the archives

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1. Amazon River

   Linked via "Madeira River"

   The primary source of the Amazon is generally traced to the Nevado Mismi peak in the Peruvian Andes, though several tributary systems, notably the Ucayali River and the Marañón River, contribute significantly to its initial volume. The confluence of these major headwaters forms the main stem, which flows generally eastward across the continent.
   The river system possesses over 1,100 named tributaries, 17 of which are over $1,500 \text{ kilometers}$ long. The most significant tributary by volume is the Madeira River.…