The portal into Molten Front is located in Mount Hyjal at 27.49, 56.35 (On the map it's above Sanctuary of Malorne and to the right of the lake) The portal says: Portal to Fireland but it's to Molten Front just to be clear.
WoW Zone
Molten Front
Level 32-35.

Details
Counts are what the current game build's data holds for this zone.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Worst things first: You need 695 Marks of the World Tree and about 40 days of questing to get all three interessting vendors!
The molten front has about 7 phases.
Phase 1
- Do Starquests in Hyjal. You must have done at least every quest up to "Aessina's Miracle"
- You'll get 8 MotWT (Marks of the World Tree) on the first day for the normal quests in Hyjal
- 3 quests with 4 MotWT on each day
Phase 2
- Requires 20 MotWT to unlock
- Overall 8 daily quests (1 new in hyjal, 4 in the newly unlocked molten front area)
- 14 MotWT each day
- Unlocks the first vendor (Zen'Vorka) which sells only 4 items :(
Phase 3 / 4
- Requires 150 MotWT (twice)
- You have to complete both MotWT quests (Druids of the Talon / The Shadow Wardens = 2 x 150)
- You'll get 7 new daily quests (15 overall).
- Once you unlock both Questlines (Druids of the Talon / The Shadow Wardens) you'll have to decide which ones daily quests you do. You cant complete both each day. So the second 150 MotWT are a complete waste of time! But you have to do them anyway :(
- The vendors for the last phases spawn and offer quests for their items. Every item is red / not purchasable until you collect 125 more MotWT for this vendor
Phase 5
- Requires 125 MotWT
- Unlocks one vendor of your choice
- You should be at day 30 at this point
- Unlocks one more daily quest (3 more MotWT each day)
Phase 6
- Requires 125 MotWT
- Unlocks the second vendor of your choice
- Unlocks one more daily quest (2 more MotWT each day)
Phase
- Requires 125 MotWT
- Unlocks the last vendor
- Unlocks an ending quest to the storyline (10 MotWT - completly useless at this point)
- Rewards you with the Flameward Hippogryph
One does not simply walk into Molten Front...
Map

The in-game map of Molten Front.
Community notes from Wowhead · 117 comments
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Named areas inside Molten Front, from the current game data.
Collectibles from Molten Front
Mounts, toys and battle pets the game data says you can obtain in Molten Front.
Toys (2)
Pets (3)
Achievements Tied to Molten Front
1 achievement in the current game data names Molten Front in its criteria.
- World Honorable Kills World Honorable Kills.