Gilimanuk, on the western tip of Bali close the the Java ferry terminal, has a wonderful shallow dive spot that has become famous as a world class muck diving site and is secret no more.
The very shallow bay has an average depth of about 5 metres and there are a couple of sand islands inside the bay called Pulau Kalong and Pulau Burung.
There is no real coral reef, just black sand and the visibility is low, sometimes less than 5 metres. There is some litter in the water and some cement blocks. These would not normally be the diving conditions of choice but this area is a nursury for small fish and weird macro critters that thrive in the nutrient rich waters brought in on the tide from the Bali Strait.
Conditions are similar to that of Lembeh Strait and although the diving is not as good as that amazing dive destination it's still excellent and macro photographers can spend hours taking shots here.
There are no real currents here so anyone can dive here although good buoyancy control is essential so as not to disturb the bottom. Beginner divers may prefer the clear water reefs in other areas of Bali.
Critters to hunt for include ornate ghost pipe fish, cockatoo leaf fish, blue crabs, snake eels and bobbit worms. Cardinal fish are found around sea urchins. Bearded scorpionfish can be seen as can the less common devil scorpionfish. Large hairy frogfish waddle along the bottom. Dragonets are seen on the bottom and the very eagle eyed diver may spot a pegasus sea moth. Nudibranchs are numerous and divers can normally find a couple of seahorses. Goatfish scavenge on the bottom and moray eels peer from their holes.