What is Hell?
The word HELL in the Bible is translated from GEHENNA- (Ge.hen'na) [Gr. form of the Heb. Geh Hin.nom', "Valley of Hinnom"]. This name appears 12 times in the Christian Greek Scriptures.
Gehenna was a the deep, narrow Valley of Hinnom, later known by this Greek name, and lay to the south/southwest of ancient Jerusalem and is the modern-day Wadi er-Rababi (Ge Ben Hinnom). (Jos 15:8; 18:16; Jer 19:2, 6) Judean Kings Ahaz and Manasseh engaged in idolatrous worship there, which included the making of human sacrifices by fire to Baal. (2Ch 28:1, 3; 33:1, 6; Jer 7:31, 32; 32:35) God said this was "a thing that I had not commanded and that had not come up into my heart" (Jer 7:31; 32:35). God looked at this as a terrible thing. Why would he use this as a picture of what he himself wanted to do? Where God planning to do the same, or was this the place they choose, away from God?