Sunken Temple (Temple of Atal'Hakkar)

Where: ! Swamp of Sorrows (only Wowhead's quest list points there).
Level: Icy Veins and Wowhead both 50-60.
Flight path: Stonard, Swamp of Sorrows is a Horde node.

Horde quests ! (Wowhead list, which it says is copied from Classic for untested dungeons; recheck at launch)

• The Temple of Atal'Hakkar: Fel'zerul, Stonard (after a short chain)
• Zapper Fuel: Liv Rizzlefix, Ratchet (after a short chain)
• Jammal'an the Prophet: Atal'ai Exile, The Hinterlands
• The God Hakkar: Yeh'kinya, Steamwheedle Port, Tanaris

Legacy: counts toward Master Spelunker, the 46-60 dungeon point (beta client data).

Sources Blizzard Legacy · Client data · Wowhead quests · Icy Veins · Wowhead overview · Wowhead Legacy