Paul McCartney left the 'Strawberry Fields' behind for a different idyllic location -- an overpass in Tulsa, Oklahoma ... no, we aren't kidding.

The singer-songwriter shared a video on TikTok Thursday of himself in the Sooner State on the bank of a river ... sitting on a slope set just a bit down from a huge highway overpass. TikTok / @paulmccartney

PM says he's got a beautiful view of the "pretty big, groovy" Arkansas River ... and, he flips the camera to show his followers the view he's looking at.

It's a peaceful place ... though we think beauty might just be in the eye of the beholder here -- 'cause the graffiti on a nearby stone edifice and the overpass behind Paul doesn't exactly want to make us "Twist and Shout."

Paul then says hello to a butterfly he apparently saw -- thou

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