|Release date||6 March 2007 (Update)|
|No. of banks||None|
|No. of altars||None|
|Teleportation||Harmony Island Teleport, Talk to Brother Tranquility|
|Inhabitants/Race||Monks, Zombie pirates, Puffins|
|Location on World Map|
|Kharidian Desert||←||Harmony Island||→||Unknown|
Harmony Island was once a peaceful island full of monks, yet now it is ridden by Zombie pirates, and the monks have become undead. The island is south of Mos Le'Harmless and only accessed during and after The Great Brain Robbery by selecting the transport option at Brother Tranquility, which is located at the docks of Mos Le'Harmless.
This island is covered in a strange green poisonous gas after a certain point in the quest. To travel outside, you will need your fishbowl helmet and diving apparatus. After finishing the quest, the gas disappears.
- Brother Tranquility - He can teleport players back to Mos Le'Harmless if necessary.
- Mi-Gor - Encountered during The Great Brain Robbery quest.
- Dr. Fenkenstrain - Only after completing The Great Brain Robbery. (If players are in need of a new Ring of Charos, then they must come here to pickpocket Dr. Fenkenstrain for a new ring. He cannot be found at his castle after the quest; you will have to go to Harmony Island in the windmill's basement.