Scholars have long disputed whether or not Beowulf reflects the influence of Classical Latin literature. This essay examines the motif of the ‘poisoned place’ present in a range of texts known to the Anglo-Saxons, most famously represented by Avernus in the Aeneid. While Grendel's mere presents the best-known poisonous locale in Old English poetry, another is found in the dense and enigmatic poem Solomon and Saturn II. The relationship between these poems is discussed beside a consideration of the possibility that their use of the ‘Avernian tradition’ points to the influence of Latin epic on their Anglo-Saxon authors.