When I was a wee lad, there was all this gungho about developing Natuna East, which had a gas reservoir with high CO2 content, which could result in one of the largest structures offshore, amazing engineering feat, spot on Mythbusters and so on.
I seem to travel over the following island a lot while visiting East Malaysia. Is this Natuna Besar?
Wata - Malaysian Oil and Gas Engineer 
Nope, its Pulau Memek.
Its famous for its monkeys and kerupuk udang. The name is derived from its smell, which is like the memek fruit.