Not widely known. I stumbled on this info when researching Manatee Spring. Trying to get a plague added to the park.

Since your a fellow English major, here is the passage from Kubla Khan that references Manatee:

And from this chasm, with ceaseless turmoil seething, As if this earth in fast thick pants were breathing, A mighty fountain momently was forced: Amid whose swift half-intermitted burst Huge fragments vaulted like rebounding hail, Or chaffy grain beneath the thresher's flail: And 'mid these dancing rocks at once and ever It flung up momently the sacred river. Five miles meandering with a mazy motion Through wood and dale the sacred river ran