From the opening lines:
* "In Xanadu did Kubla Khan**" - Repetition of the "K" sound.
* "A stately pleasure-dome decreed" - Repetition of the "s" sound.
* "Where alf the gardens bloom" - Repetition of the "g" sound.
From the rest of the poem:
* "Five miles meandering with a mazy motion**" - Repetition of the "m" sound.
* "And mid these mountains green**" - Repetition of the "m" sound.
* "With sunless rills meander**" - Repetition of the "s" sound.
* "A sacred river ran**" - Repetition of the "r" sound.
* "Through caverns measureless to man**" - Repetition of the "m" sound.
* "The shadowy steep and withered peak**" - Repetition of the "s" sound.
These are just a few examples. Coleridge uses alliteration throughout the poem, often to enhance the imagery and create a sense of musicality.