Gates of Justice

The Gate of Justice (正義の門, Seigi no Mon) is the final location in Enies Lobby. Once you pass beyond the gate, the only two places you can go are Marine HQ or Impel Down. Once a criminal passes through the gates, there is no longer any hope left for them; no one can save them from going to Impel Down.

In order for ships to pass into Enies Lobby, the gates must open. Opening the gates causes the waterfalls around Enies Lobby to fill up, allowing safe passage to and from the island.