Possible Clues:

• Book published that is about sultanate
• Nation whose full name ends with “Abode of Peace”
• Nation keeps uranium in brine mixture
• Sultanate enclave of Borneo
• Sultanate sometimes known as the Abode of Peace
• State of old character residing in British India
• Country governed by leader in Borneo: that is revolutionary
• British character of old sent to India or another country
• Country largely surrounded by Malaysia
• Asian sultanate, British-administered, that is to the west