The Anambas are a group of islands in the South China Sea, nestled midway between Singapore and the oil-rich Natunas Archipelago. The main islands are Matak, now a base for oil exploration, Tarempah and Jemaja Andriabu.
Map of the Anambas archipelago
The islands has become a popular destination for divers from Singapore. Check out some of the best know sites:
Underwater reef systems of Tokong Malangbiru island
To date, many minor islands of the Anambas archipelago remain unexplored and may potentially house rewarding dive sites. With over 432 recorded species of fish, there is still the prospect of swimming into rare and unrecorded ones. You will certainly find all the ubiquitous denizens of the reef here; clownfish, jacks, groupers, parrotfish, nudibranches are sure to be sighted on every dive, dazzling you with their sheer numbers. Pristine reefs line the bottom of almost all the islands in Anambas. You can find hard and soft corals carpeting the entire seabed blooming with colour and abundance.
The submerged Acasta Rock
Acasta Rock is the pinnacle of an undersea hill, rising to just 3-4 metres beneath the sea level. With an ample supply of cold nutrient-rich waters from the depths of the South China Sea and constantly bathed by sunlight, Acasta Rock supports a dazzling growth of soft corals, and schooling fish life such as fusiliers, as well as large bumphead parrot-fishes, jacks, turtles and the occasional visiting manta-ray.
Wrecks of the Sunken Vessels
The Seven Skies wreck sits upright on the bottom at a bottom depth of about 50m. The top of its funnel (at low tide) sits at around 24m and provides some shelter from the tide and has the most beautiful corals encrusting her sides with small fish darting in and out the various encrustations. 
The pelagic life here is remarkable, its like a whole new ecosystem self sufficed from this wreck. There are several penetration points to various locations in the hull, but these are only advisable for the technical divers.
Another ship, the Dutch merchant Sara-D, measures 80 metres bow-to-stern and lies sideways smack in the middle of a shipping channel at a depth of 55 metres on the seabed, and rising up to 35 metres below sea level. It is frequented by schools of barracudas, batfish, eagle rays, oceanic reef sharks, and large snappers. It also has an incredible amount of resident Jacks that just seem to be everywhere.
How long is the boat trip
It is a half-day's boat ride from Singapore to reach the first dive sites of the Anambas archipelago. Because of the long distances and the sheer isolation of the dive sites, diving at Anambas is made possible only by a couple of liveaboard boats that service the area.
Please be informed that diving at the above sites are dependent on diving conditions and the technical skills of the participants.