Take a left at the fork while entering the tunnel before the zone, and head north, not south.
Once in Halvung, take a left at the fork again. Proceed over the 'bridge' over the lava at (F-8), and through the Cast Bronze Gate (just select it, no key required). Keep left and then bear right through another gate at (G-7), drop down the ledge, and then follow the path to the pop at (J-6).