Lethe [LEH-thee], representing oblivion.
The Danaides [dan-AH-ee-dees] pour water into a vast pot in this location, where the Cumaean Sibyl brings Aeneas to meet Anchises [an-KIH-sees]. Pirithous is tricked into staying in this location, which contains the river (*) Lethe [LEH-thee], representing oblivion. Elysium and Tartarus are portions of this land. It is reached with help of Charon and guarded by Cerberus, a three-headed dog. Persephone is the queen of, for 10 points, what Greco-Roman underworld ruled by a namesake god?
The Danaides [dan-AH-ee-dees] pour water into a vast pot in this location, where the Cumaean Sibyl brings Aeneas to meet Anchises [an-KIH-sees].
Hades (accept Greek underworld or Greco-Roman underworld before that term is read; accept Tartarus before "Aeneas" is read; prompt on "underworld" before it is mentioned; prompt on "hell")