What is the libero replacement zone in volleyball?

The libero replacement zone is the area between the attack line and the end line on the sideline near the scorer's table. The libero must enter and exit the court through this zone during a dead ball.

Full Explanation

Per FIVB Rule 19.3.2, the libero replacement zone is the part of the free zone between the attack line and the end line, on the sideline adjacent to the scorer's table. All libero exchanges must take place in this zone during a dead ball (between rallies). The libero may only replace a back-row player, and the same player who exited must return when the libero leaves. There is no limit on the number of libero replacements per set, and replacements are not counted as substitutions. NFHS and NCAA maintain similar libero replacement zone requirements.

Rulesets covered: FIVB/USAV/NFHS/NCAA  |  Rule Reference: FIVB Rule 19.3.2