In Samuel Taylor Coleridge’s poem “Kubla Khan,” the river running through the pleasure-dome landscape is Alph.
The poem describes a magnificent pleasure-dome ordered by Kubla Khan in Xanadu. Through the surrounding landscape runs the sacred river Alph, which moves through caverns before reaching a “sunless sea.” The river gives the poem’s dreamlike setting both movement and mystery.
“Kubla Khan” was published in 1816 with the subtitle “A Vision in a Dream.” Coleridge’s famous preface claimed that the poem came from an interrupted opium-influenced dream, though the history and reliability of that account have long been debated.
Alph is a poetic, invented river rather than a standard geographical name. Readers sometimes confuse it with the real rivers associated with Xanadu or with the River Alph in later literary and popular references.