Western Plaguelands: There are some great mobs that are very profitable to farm wow gold in this area. The mobs in Felstone Field can be farmed for a good amount of Runecloth because they re-spawn very quickly and you should never have to wait for them. Rotting Behemoths are also great targets for farming. They can be found towards the east area of the map. These mobs drop the Greater Nature Protection Potion recipe that can easily be sold for 100 or more wow gold.
 
Winterspring: The ghosts found at Lake of Ke Theril in this area can be farmed for their green and silver items. Towards the southeast of this spot, you will be able to farm for the Mature Blue Dragon Sinew by killing the Scalebones and Cobalt Mageweavers mobs. Even though it has a very low drop rate for the Mature Blue Dragon Sinew, it is very rewarding when they eventually do so.
 
Azshara: There are Highborne Ghosts that are around levels 45 to 47. They can be quite difficult to kill but the items like Green Items and Mageweave that they drop are very rewarding when amassed in huge quantities.