' Note: the poem contains a factual error: it was Balboa, rather than Cortez, who would have stood 'Silent, upon a peak in Darien' (Cortez conquered the North American lands of modern-day Mexico; Darien is in Panama at the top of South America). Whether this error mars the poem or not depends on your view of poetry (and assuming that the error is an error on Keats's part, rather than artistic licence). '

That is from

https://interestingliterature.com/2016/02/25/a-short-analysis-of-keatss-on-first-looking-into-chapmans-homer/