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