Wikipedia
Arethuse
The Arethuse is a fountain on the island of Ortygia in Syracuse, Sicily.
The fountain is mentioned in a number of poems, for instance John Milton’s Lycidas (l. 85) and his masque Arcades, as well as Alexander Pope’s The Dunciad (Bk 2, l. 342) and William Wordsworth's The Prelude (Bk X, l. 1033); which they would have known from Virgil's Tenth Eclogue (l. 1) and Theocritus' Idylls (I, l. 117). Virgil reckons the eponymous nymph as the divinity who inspired bucolic or pastoral poetry.