The waters around the UAE are rich in a variety of marine and coral life, and it is possible to dive all year round in the warm seas. In addition to exotic marine life such as clownfish and seahorses, divers may be able to spot rays, moray eels, small sharks, barracuda, sea turtles and much more.
Many good dive sites are easily accessible from Abu Dhabi, including wreck or deepwater dives and reef dives.
Snoopy Island
So called because it looks like snoopy lying on his back taking a snooze, Snoopy Island is one of the most extensively dived sites in the country. The shallow waters around Snoopy Island off the coast of Khor Fakkan in the emirate of Sharjah are also ideal for less experienced diver.Reaching depths of up to 18 metres, reef shark, stingrays, turtles and moray eels can regularly be spotted.
Located just 100 metres off the beach rolling up to the popular weekend getaway of the Sandy Beach Hotel, the corals and gentle currents make it perfect for smokeless.
Dibba Island
Further north, close to the Omani border, sits the rugged Dibba Island which will virtually guarantee a view of turtles. Night dives are something special here with colourful coral aplenty and it's an excellent venue for snorkeling too.
Shark Island
Also known as Khor Fakkan Island, Shark Island is one of the most elegant places to spend a day's diving in the UAE. Its close location to shore makes it easily accessible and there's a tidy little beach ideal for picnics and sunbathing. The down side is that the rocks are covered in nasty little urchins that can sting when stood upon. The island, as its name suggests, is frequently visited by sharks in the winter months along with a vast assortment of fish and the odd ray or two.
Coral Garden
For a true botanical adventure under the waves, the aptly named Coral Garden is the place to visit. Located close to Shark Island, Coral Garden is an explosion of colour sprawled over a multi-tiered area and inhabited by a multi-coloured fish population. Coral Garden is home to species of coral that can't be found in most places of the UAE and its tricky location means it is more suited for the experienced diver.
source:
http://www.bsactravelclub.co.uk/where/uae.htm