From WoWWiki

The Arena Floor is a free-for-all PvP circle inside the Ring of Trials in Nagrand.

Subzones of Nagrand

Abandoned Armory • Aeris Landing • Ancestral Grounds • Arena Floor • The Barrier Hills • Burning Blade Ruins • Clan Watch • Elemental Plateau • Forge Camp: Fear • Forge Camp: Hate • Garadar • Halaa • Halaani Basin • The High Path • Kil'sorrow Fortress • Lake Sunspring • Laughing Skull Courtyard • Laughing Skull Ruins • The Low Path • Mag'hari Procession • Nesingwary Safari • Northwind Cleft • Oshu'gun • The Ring of Blood • The Ring of Trials • Skysong Lake • Southwind Cleft • Spirit Fields • Sunspring Post • Telaar • Telaari Basin • Throne of the Elements • The Twilight Ridge • Warmaul Hill • Windyreed Pass • Windyreed Village • Zangar Ridge