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In page Tartarus:

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In Roman mythology, sinners (as defined by the Roman societal and cultural norms of their time) are sent to Tartarus for punishment after death. Virgil describes Tartarus in great detail in the Aeneid, Book VI. He described it as expansive. It is surrounded by three perimeter walls, beyond which flows a flaming river named the Phlegethon. Drinking from the Phlegethon will not kill a mortal and it will heal while causing great pain. To further prevent escape, a hydra with fifty black, gaping jaws sits atop a gate that screeches when opened. They are flanked by adamantine columns, a substance that, like diamond, was believed to be so hard that nothing can cut through it.[citation needed]