You can find the Maraudon Foulspore Cavern dungeon within Desolace, Kalimdor.
The coordinates are (29.9,63.0)
/i Inflicts a poison on all players when casts Toxic Volley. Watch out for Uppercut, knocks away current target. Boss will split into 5 spawns, kill all spawns to re-target him.
/i Cleave will inflict physical damage to nearest targets. The bosses current target will be taking Puncture & Thrash attacks.