Includes pits where once you fall, you're never coming back. Either you die during the fall, hitting the bottom or there's just no way out of them and the game doesn't have the grace to call it a game over.
Alternate name: Bottomless pits
The first video game about Death pits was released in 1986.
Note that this is NOT for the non-fatal kind that only drops your health a bit but does not really prevent progressing in the game.