an area in W Italy, SE of Rome: formerly marshy, now drained.
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British Dictionary definitions for pontine marshes
/ (ˈpɒntaɪn) /
an area of W Italy, southeast of Rome: formerly malarial swamps, drained in 1932–34 after numerous attempts since 160 bc had failedItalian name: Agro Pontino (ˈɑːɡro ponˈtiːno)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012