Nusa Lembongan (Nusa = Island) is one of three neighbouring islands of Bali, approximately 12 miles from south east Bali and 20 miles from Lombok. The other two (2) islands are Nusa Penida being the bigger and Nusa Ceningan being the smaller.

Nusa Lembongan is a pristine tropical island, its highest point is 50 meters above sea level. Lembongan has an average rainfall of approximately 1000 mm per year. Little temperature variation from 30 degrees Celsius occurs between the only two seasons this island experiences being the wet and the dry. The wet season is from December to February and the dry is from March to November. As it has only three months of rainfall, this island is dry for the remainder of the year. Little cultivation occurs, as almost 2/3 of the island is infertile. Seeding is normally done on the wet season and only corn, cassava and peanuts are farmed. Also found on the island are cashew nuts, mangoes and coconut. Fresh water is limited and most of the supply is derived from wells up to 60 meters deep.

Nusa Lembongan is located on the Wallace line. Sir Alfred Wallace, a historic naturalist who conducted extensive studies of this area, determined the Wallace line. The Wallace line is still recognised as a biological division between Asia and Australia/Pacific. Many species of bird, animal and flora indigenous to Australia are not found West of this line, as the flora and fauna on the west “Asian” side are not found to the east of this line. The ocean currents that funnel their way between these islands are rich in macrobiotic life that support abundant coral and fish life in shallow waters surrounding these islands. [via]

Nusa Penida is an island southeast of Bali island, Indonesia. Administratively, the island is a subdistrict of Klungkung regency. There are two small islands nearby: Nusa Lembongan and Nusa Ceningan. The Badung Strait separates the island and Bali.

Diving sites
Nusa Penida covers a wide area of diving locations. They are Penida Bay, Manta Point, Batu Meling, Batu Lumbung, Batu Abah, Toyapakeh and Malibu Point. The flow through the Lombok Strait is, overall, south-tending, although the strength and direction of the tidal streams are influenced by the monsoon seasons.

During the southeast monsoons, the tidal flow tends south; during the northeast monsoons, the tidal flow tends north. In the area of the strait north of Nusa Penida, the pattern is relatively simple, with a flow, at peaktide, of about three-and-one-half knots. Tidal streams in Badung Strait are semi-diurnal, but the character of the stream is very complicated because its direction runs obliquely to the general south to north direction of Lombok Strait, and the channel has a curved shape.

Toyapakeh
Toyapakeh has a stretch of reefs, and in the southern part of the bay there is a similar area of rugged bommies, rich with color and fish. Big schools of fish, sea turtles, and occasionally molas are highlight of Toyapakeh diving. Toyapakeh is special for its pillars of coral.

Malibu Point
Malibu Point is a diving site with gray reefs, reef white tips, silver-tips and numerous sharks. While Penida Bay is another anchorage, and the rocky islands have an interesting forms; something like an old resting elephant. The bay is vulnerable to swell, creating-up-and-down-currents. Then, Manta Point is a limestone rock off Pandan cafe. The swell is relatively strong.

Nusa Penida/Lembongan
Nusa Penida/Lembongan is a diving site with vast spread of coral reefs and good visibility. Big fishes are frequently observed at the area. Manta rays or sunfishes appear in the certain season.
The site is also known of the very strong currents requiring divers some skills.

Crystal Bay
Crystal Bay is calmer than outer shore. There are many Antheases. A school of batfish comes around periodically. A bat cave is located nearby.

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