The Stone Basin is located on the island in the middle of a vast black lake within the cave.

From the Story

Harry Potter and the Half-Blood Prince

Discovered in chapter 26, The Cave

The basin is full of a phosphorescent emerald liquid, which is protected by an invisible barrier, unable to be penetrated by a human hand, in which Lord Voldemort hid a Horcrux. The emerald liquid is a potion created to prevent the drinker from reaching the Horcrux - Salazar Slytherin's locket.

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