Bida Nai - Similan Islands

Bida Nai is one of those places that feels a bit more rugged than some of its Similan neighbours, and that's exactly why we like it. The site is a limestone island, and those dramatic rock formations continue below the surface, creating some great swim-throughs and gullies to poke around in. We usually see plenty of zigzag clams clinging to the walls, and there are some truly massive gorgonian sea fans swaying in the current. It’s a good spot for divers who enjoy exploring rocky topography, rather than just drifting over coral. You’ll often find us taking our time here, just enjoying the quiet feel of the place.

Location
Similan Islands, Thailand, Southeast Asia
Coordinates
7.650000, 98.783300

Marine Protected Area: Krabi Environmental Protected Area

Best Time to Dive in Similan Islands

The warmest water temperatures in Similan Islands occur in May, averaging 30.8°C. The coolest conditions are in January at 28.6°C.

Monthly Water Temperatures

  • January: 28.6°C
  • February: 29.0°C
  • March: 29.6°C
  • April: 30.6°C
  • May: 30.8°C
  • June: 29.9°C
  • July: 29.6°C
  • August: 29.3°C
  • September: 29.0°C
  • October: 29.0°C
  • November: 29.2°C
  • December: 28.7°C

Nearby Dive Sites in Similan Islands

Nearest Dive Centres to Bida Nai

Marine Life in Similan Islands

Home to 183 recorded species including 127 reef fish, 38 hard corals, 9 seagrass & algae, 4 sharks & rays, 2 other, 1 octopus & squid.

Notable Species

Recommended Packing List for Bida Nai

Based on average water temperature of 29.4°C, currents 7 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 marine life can I expect to see when diving at Bida Nai?
At Bida Nai, you can expect to encounter a vibrant array of marine life, particularly along its underwater walls. Divers frequently observe fascinating creatures such as zigzag clams, huge gorgonian sea fans, and delicate sea whips. These species contribute to the rich biodiversity of this marine environment, making for a captivating dive.
What are the typical depths for diving at Bida Nai?
Our current data does not specify the typical depths for diving at Bida Nai. However, as a reef dive site, it generally offers a range of depths suitable for various experience levels. We recommend consulting with local dive operators for the most up-to-date information on specific dive profiles and conditions.
How difficult is the Bida Nai dive site, and is it suitable for beginners?
The Bida Nai dive site is rated as intermediate difficulty. This classification suggests it is generally not recommended for absolute beginners. Divers should possess some prior experience and comfort in varied underwater conditions before attempting this site.
What are the usual current and visibility conditions at Bida Nai?
Our current data does not provide specific details regarding the usual current and visibility conditions at Bida Nai. As conditions can vary significantly, it's always best to check with local dive centers or your dive guide immediately before your dive. This ensures you have the most current information for a safe and enjoyable experience.
When is the best time of year to dive at Bida Nai?
The best time of year to dive at Bida Nai is not specified in our available data. However, general diving seasons for the Similan Islands region often dictate optimal conditions. For more detailed information on seasonal variations, please refer to our When to Dive guide or consult local operators.
Do I need a specific certification level to dive at Bida Nai?
Given that Bida Nai is classified as an intermediate dive site, a basic Open Water Diver certification might be sufficient, but an Advanced Open Water certification or equivalent experience is highly recommended. This ensures you have the necessary skills and comfort level to safely enjoy the site's features. Always check with your dive operator for their specific requirements.