Gili Nanggu is the headline island of the Secret Gilis archipelago in Sekotong Bay, with one of Lombok's calmest, easiest house reefs — ideal for first dives, refresher dives, and PADI Discover Scuba experiences. The reef sits in 5–18m of water with intact hard coral, schooling fusiliers, resident green turtles, and almost no current on most days. There is no dive shop on Nanggu itself; trips run from Sekotong village (15-min boat) or as part of Secret Gilis day-trips. Fun dive 475–550k IDR; Discover Scuba 1.0–1.3M IDR.
# Diving Gili Nanggu: The Calmest Reef in the Secret Gilis
Gili Nanggu is a tiny coconut-fringed island in Sekotong Bay, south-west Lombok, less than a kilometre across and ringed by a fringing reef that sits in 5–18 meters of water. There's a small beach hut, a few sun-loungers, and exactly zero dive shops on the island itself. What it does have is some of the calmest, most beginner-friendly diving in Lombok, and a resident green turtle population that's habituated enough to dive groups that sightings are virtually guaranteed.
If you're learning to dive, doing a first refresher after a long break, or bringing a non-diving partner who wants to try Discover Scuba, Gili Nanggu is the right choice.
Three reasons:
1. Calm water: Sekotong Bay is sheltered from the south-easterly swell that hits the rest of Lombok's south coast. Nanggu sits in the middle of the bay and benefits from this protection. On a typical morning the surface is glass.
2. Easy depth profile: The house reef tops out around 5m and slopes gently to 18m. There are no walls, no sudden drop-offs, no current channels.
3. Predictable turtles: A resident population of 8–12 green turtles feeds on the seagrass beds south of the island. Sighting rate is over 90% on a typical morning dive.
The trade-off is variety. Nanggu has one main reef. If you're doing 3+ dives over multiple days, you'll want to combine Nanggu with neighbouring Gili Sudak, Gili Kedis, and Gili Layar.
Because there's no dive shop on the island, all Nanggu diving is run as a boat trip from Sekotong village (15 minutes by boat) or as part of multi-island Secret Gilis day-trips arranged from Mataram, Senggigi, or Kuta.
The two operators with serious local knowledge are Dive Sekotong (PADI, based in Sekotong village) and Sekotong Dive Centre (SSI). Both run morning and afternoon trips to Nanggu and combine it with neighbouring sites.
A typical Nanggu day:
Topography: gentle reef slope. Hard coral garden in the 5–10m range, sand patches with seagrass at 10–15m, deeper rubble and isolated coral heads at 15–18m.
Marine life:
Visibility:
Water temperature: 27–29°C year-round (roughly 1°C cooler than the Gili Trio).
Nanggu is one of the best places in Lombok to do a first-ever try-dive. The combination of calm water, shallow depth, predictable turtles, and the relaxed beach base makes for a low-stress introduction.
A standard Discover Scuba session:
1. 30-minute briefing on the beach: equipment overview, basic skills, breathing technique
2. Confined-water practice in waist-deep water: regulator clearing, mask clearing, ascent and descent
3. Open-water dive to 6–10m depth at the house reef: 30–40 minutes, instructor-led, max 2 students per instructor
Price: 1.0–1.3M IDR including all equipment, instructor, and lunch. PADI certification not given (this is a try-dive, not a course) but the session counts as the first dive of an Open Water course if you choose to continue.
These prices are slightly lower than the Gili Trio, reflecting the smaller scale of the operators here.
June–September: Peak. Visibility 20–25m, glassy mornings, water 27–28°C. Book everything in advance.
April–May & October: Shoulder. Visibility 15–22m, occasional rain, fewer crowds.
November–March: Wet season. Visibility 8–15m, occasional storms cancel boats. Diving still possible most days.
Within any day, 9:00–11:00am is the prime window. Marine life is most active, water is clearest before any boat traffic stirs sediment, and the sun angle at 9am is ideal for photography.
A two-day Sekotong dive program from a Sekotong base:
Day 1:
Day 2:
This gives you a complete sample of the Sekotong archipelago. Total cost roughly 2.5–3.2M IDR in dive fees plus accommodation.
Be honest:
If you're after big sites or pelagic action, dive Belongas. If you're after Open Water training with quiet water and easy turtles, Nanggu is the right pick.
Gili Nanggu is reached by boat from Sekotong village (15 min, included in dive shop trips) or as part of multi-island day-trips arranged from Mataram, Senggigi, or Kuta. There is no public ferry. Most divers book through Dive Sekotong or Sekotong Dive Centre, who handle the boat charter. Independent boat charter from Sekotong is around 600–900k IDR for a half-day return for 2–4 divers.
Gili Nanggu vs Gili Trawangan: Nanggu is dramatically quieter, with calmer water and intact coral, but no nightlife and much less variety of dive sites. Nanggu vs Gili Air: similar calm character but Nanggu is even quieter and fully day-trip oriented (no overnight dive resort on the island itself). Nanggu vs Gili Kedis: Kedis is even smaller and shallower; Nanggu has more substantial reef and turtle population. Nanggu is the best Secret Gilis pick for first-time divers and Discover Scuba experiences.