Permanent river of lava

Rivers of lava are a staple of fantasy. But in the real world, lava flows are usually very short-lived phenomenons caused by volcanic eruptions.

Is there some plausible way on an otherwise earth-like world to have a naturally occuring river of lava which is several meters wide, several kilometers long and functions as a permanent geographical feature? With "permanent" I mean permanent enough that someone would draw it on a map which is still useful a couple decades later.

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Permanent river of lava

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