This question already has an answer here:
Men go outside Arda to the Timeless Halls when they die. Elves and Dwarves to the Halls of Mandos, i assume Hobbits have the same fate as Men. so where do Orcs go after they die or are Killed? do they stay within the confines of Arda? rot where they lie? leave the world? is there information pertaining to this?