What are all the "Ring of Blood" arena-style quest chains?

Question

I'm looking for a list of all the PvE arena-style quests in WoW, where you fight an elite monster for a group quest, turn in the quest nearby, and receive a follow-up quest for more of the same: for example, the Ring of Blood quests in Nagrand or the Amphitheater of Anguish quests in Zul'Drak.

The First Rule of Ring of Blood is You Don't Talk About Ring of Blood achievement requires three of these types of quests, but I know it misses a horde-only chain in Grizzly Hills and a chain in Icecrown.

Are there any more PvE arena quest lines? What are they?

Answer 1

This is the list of "Ring of Blood"-style quest lines as I know it, in order of suggested level:

• Durnholde Challenge in Hillsbrad Foothills

• The Thunderdrome in Tanaris

• Ring of Blood in Nagrand

• The Conquest Pit in Grizzly Hills

• Ampitheater of Anguish in Zul'Drak

• Battle at Valhalas in Icecrown

• Crucible of Carnage in Twilight Highlands

• The Arena of Annihilation scenario¹

^{Note 1: in Mists of Pandaria, Blizzard opted to make most, if not all, new group quest chains into scenarios, including the expansion's "Ring of Blood" quest line}