Gili Nanggu is the main 'secret Gilis' island off the south-west Sekotong peninsula and offers easy fish-feeding shore snorkeling within 5 meters of the beach. The reef is shallow and bleached in places but still hosts thick schools of sergeant majors, parrotfish, and the occasional reef shark in deeper water. Most visitors come on a half-day boat tour (300–450k IDR per person) combining Nanggu with Sudak, Kedis, and Tangkong — DIY access via Tawun pier is possible but cheaper only in groups.
# Snorkeling Gili Nanggu: The Day-Trip That's Neither as Magic Nor as Bad as Reviews Claim
Gili Nanggu is the headline island of the "Secret Gilis" — the cluster off the south-west Sekotong peninsula that includes Nanggu, Sudak, Kedis, and Tangkong. Travel agencies sell it as "untouched paradise." TripAdvisor reviewers split between "best day of our trip" and "tourist trap." The truth is somewhere in between, and the gap between expectation and reality depends almost entirely on what you compare it to.
If you've been to the main Gilis (Trawangan, Meno, Air) and expect the same, you'll be disappointed. If you arrive expecting a quiet island day-trip with shallow fish-feeding snorkeling and a couple of decent photos, you'll have a fine time.
Let's deal with this directly: Gili Nanggu's reef is in poor-to-moderate health. The El Niño bleaching events of 2016 and 2024 hit hard, and the shallow zones in front of the main beach are dominated by dead coral structure with patchy live cover. You'll see plenty of small reef fish — sergeant majors, parrotfish, butterflyfish, surgeonfish — but the dramatic coral wall photos in agency brochures are mostly from Tangkong, not Nanggu.
The fish density is genuinely high near the beach because boat operators and the warung have been hand-feeding for years. Throw bread in the water at the main beach and you'll be surrounded by 200+ sergeant majors in 30 seconds. This makes for impressive selfies. It is also exactly the kind of behavior reef ecologists have been pleading with operators to stop, because feeding skews fish populations and trains them to expect food, which makes them aggressive and unhealthy.
You can either participate or skip it. We'd suggest skipping.
The east side of Nanggu, around the small headland 200m south of the main beach, has better coral cover than the central zone. Most tour groups never walk down here — they unload on the main beach and stay there. If you wade or fin around the headland, you'll find healthier coral, fewer fish habituated to feeding, and the chance of seeing a small reef shark in the deeper water (3–4m) at the channel between Nanggu and the smaller offshore reef.
The west side, behind the warung, is shallower and has more sand than coral. Good for kids and weak swimmers. Not interesting for anyone after marine life.
Nanggu is 4km offshore from Tawun pier on the Sekotong peninsula. Tawun is 1.5–2 hours by car from Mataram, 2 hours from Senggigi, 3 hours from the Gili main port at Bangsal. The drive crosses the sleepy west coast and the empty Sekotong peninsula, which is itself worth seeing if you've time.
Most visitors book a Sekotong day-trip package from Senggigi or Kuta Lombok hotels. These run 550–800k IDR per person and include transport, a boat with stops at 3 or 4 of the Secret Gilis, lunch, and return. That's the easy way and accounts for 80% of visitors.
The cheaper way: drive yourself to Tawun, walk to the pier, negotiate a 4-island boat charter for 400–500k IDR (per boat, not per person — fits 4–5 people comfortably). Bring your own snorkel gear, lunch, and water. Total day cost split between four people works out around 200k IDR each. This is the right play for groups but pointless for a single traveler.
Standard tour stops in order:
Nanggu — main island, beach landing, fish-feeding, single warung. Tour spends 60–90 minutes here.
Sudak — smaller, has a quieter beach and a second warung. South side has decent coral. 30–45 minutes.
Kedis — tiny heart-shaped islet with no infrastructure. Photo stop only — boats anchor offshore and you can swim ashore for 15 minutes. The reef is OK but the highlight is the silly aerial-photo backdrop.
Tangkong — the actual best snorkeling of the four. Drop-off reef in 8–15m of water with healthier coral and bigger fish. Often skipped or shortened by tours because there's no beach to land on, just water snorkeling from the boat. Demand at least 45 minutes here if your tour wants to skip it.
If you want the best snorkeling in the Secret Gilis, the trick is to push your tour to spend less time on Nanggu and more on Tangkong.
Dry season (May to October) gives 12–18 meter visibility on calm mornings. Water temperature 27–29°C year-round. Mornings are dramatically better than afternoons because the south-easterly trade wind picks up after 11am and chops the surface, which both reduces light penetration and stirs sediment.
Wet season (November to April) drops visibility to 5–10 meters as freshwater runoff from the Sekotong rivers carries sediment into the channel. You can still snorkel, but the photos suffer and the coral colors dull. The single best month is May or September, dry-season clarity without August peak crowds.
If you're staying in Senggigi or Kuta and have a free day, yes — it's a fine day-trip and the Sekotong drive itself is interesting. If you're already on Gili Air, Meno, or Trawangan, no — the snorkeling is honestly worse than what you have at your doorstep, and the journey eats most of a day.
The honest pitch for Nanggu isn't "untouched paradise." It's "easy beach day with fish-feeding photos and a low bar to entry." Set that expectation and you'll enjoy yourself.
Drive or scooter from Mataram/Senggigi to Tawun pier in Sekotong (1.5–2 hours, 60–80km). From Tawun, public boats and charters depart for Nanggu (15 min, 4km offshore). Most visitors join a pre-booked Sekotong day tour from Senggigi (550–800k IDR including transport, boat, lunch). DIY: 200k IDR Grab to Tawun, 400–500k IDR shared boat for 4 islands, return same evening. There is no overnight infrastructure on Nanggu — day-trip only since the bungalow operation closed.
Gili Nanggu vs Gili Air: Nanggu is quieter and the reef is more accessible from shore, but coral health is worse and there are no resident turtles. Gili Air wins for marine life. Nanggu vs Gili Tangkong (also Secret Gilis): Tangkong has dramatically better coral and a real drop-off wall but no beach infrastructure — Nanggu is the easy option, Tangkong is the prize. Nanggu vs Sekotong mainland reefs: Nanggu has clearer water and better sand entry; Sekotong shore reefs are more degraded but cheaper to reach.