Marianne - Inner Islands

Petit Byahau is one of those sites we keep coming back to. Yes, you’ll probably share it with other dive boats, but don't let that put you off. It’s popular for good reason. Dropping down, you often feel a gentle push, settling into a relaxed drift along a reef that’s seriously packed. We’re talking about corals so dense they form valleys and overhangs, creating countless hidey-holes. Our favourite trick here is to slow right down, particularly when that current is barely noticeable. Scan the sand for Sand Stargazers, they're always a thrill to spot, eyes peering up. In the nooks, you’ll find Reef Scorpionfish blending in perfectly, and the Spaghetti Eels wave out of their holes. Keep an eye out for the small stuff too – Blackfin Blennies are pretty common, and the Mottled Conger Morays are surprisingly bold here. Visibility usually holds around 15 metres, which is plenty to soak it all in. Petit Byahau works for just about any diver looking for a chill, rewarding dive with plenty of chances for macro discoveries and an easy drift.

Location
Inner Islands, Seychelles, Indian Ocean & East Africa
Coordinates
-4.351700, 55.921700
Type
drift

Marine Protected Area: Ile Coco National Park

Best Time to Dive in Inner Islands

The warmest water temperatures in Inner Islands occur in April, averaging 30.4°C. The coolest conditions are in August at 26.6°C.

Monthly Water Temperatures

  • January: 28.7°C
  • February: 29.0°C
  • March: 29.8°C
  • April: 30.4°C
  • May: 29.8°C
  • June: 28.5°C
  • July: 26.8°C
  • August: 26.6°C
  • September: 27.4°C
  • October: 28.3°C
  • November: 29.0°C
  • December: 29.1°C

Nearby Dive Sites in Inner Islands

Nearest Dive Centres to Marianne

Marine Life in Inner Islands

Home to 184 recorded species including 156 reef fish, 8 hard corals, 6 sharks & rays, 5 sea snails & nudibranchs, 4 whales & dolphins, 2 other.

Notable Species

Recommended Packing List for Marianne

Based on average water temperature of 28.6°C, currents 11 cm/s.

  • Shorty or Rashguard - warm 29°C water needs minimal exposure protection
  • Mask - essential for every dive
  • Fins
  • BCD - buoyancy compensator
  • Regulator - your most safety-critical piece of gear
  • Dive Computer - tracks depth, time, and NDL
  • Surface Marker Buoy (SMB) - essential for boat pickups
  • Dive Torch - useful for crevices and colour at depth
  • Underwater Camera - capture your diving memories

Frequently Asked Questions

What is the typical depth range for diving at Marianne?
Divers at Marianne can expect to explore depths typically ranging from 12 meters, with a maximum depth of 18 meters. This allows for excellent viewing of the site's beautiful granite islands and fun passages.
What marine life and underwater features can divers expect to see at Marianne?
Marianne is renowned for its vibrant marine life and unique underwater topography. Divers can expect to encounter various shark species, including black and white tip sharks, Whale Sharks, Guitar Sharks, and Grey Reef Sharks. Additionally, you might see impressive schools of 10-50 Eagle rays, Bumphead Parrotfish, and Turtles, all amidst beautiful granite islands and many fun passages.
Is Marianne a difficult dive site, and what level of experience is recommended?
Marianne is classified as an intermediate difficulty dive site. It is typically a drift dive, which requires divers to have some experience managing currents. This makes it suitable for certified divers who are comfortable with drift diving techniques.
When is the best time of year to dive at Marianne?
The provided data does not specify the best time of year to dive at Marianne. For general information on seasonal diving conditions in the Seychelles, please refer to our When to Dive guide.
What dive certifications are needed to dive at Marianne?
As Marianne is an intermediate drift dive, divers should possess the necessary experience and training for such conditions. While specific certification levels are not provided, it is recommended that divers are comfortable with drift diving techniques and have experience diving to depths of 18 meters.
What are the typical current and water conditions like at Marianne?
Marianne is typically a drift dive, indicating that currents are usually present and contribute to the diving experience. Divers can expect excellent water clarity, with an average visibility of 18 meters, offering clear views of the abundant marine life and granite formations.