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 (mär′ən-yōn′, mä′rä-nyōn′)
A river flowing about 1,610 km (1,000 mi) from west-central to northeast Peru, where it joins the Ucayali River to form the Amazon.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Spanish maraˈɲɔn)
(Placename) a river in NE Peru, rising in the Andes and flowing northwest into the Ucayali River, forming the Amazon. Length: about 1450 km (900 miles)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌmɑ rɑˈnyɔn)

a river in Peru, flowing N and then E, joining the Ucayali to form the Amazon. 1000 mi. (1600 km) long.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.