Where was Joram's body thrown?

Answer: Into Naboth's field

Jehu had Joram's body thrown onto the field of Naboth the Jezreelite, repaying Ahab's house for Naboth's blood.

“And Jehu said to Bidkar his officer, “Pick him up and throw him into the field of Naboth the Jezreelite. For remember that when you and I were riding together behind his father Ahab, the LORD lifted up this burden against him:”— 2 Kings 9:25 (BSB)