Dive Site: Koh Phi Phi — Bida Nai

About Koh Phi Phi — Bida Nai

Koh Bida Nai, a tiny limestone islet nestled at the southern tip of the Phi Phi Archipelago, stands as one of the premier dive sites among the Phi Phi Islands. Renowned for its exceptionally healthy reefs and diverse marine life, this site offers a range of underwater experiences. Topography varies from sheer walls dropping over 20 meters, adorned with hard and soft corals and teeming with reef fish, to gently sloping sandy bottoms featuring impressive, large sea fans. Further south, the wall transitions into a beautiful sloping reef, with shallower areas often revealing cruising blacktip reef sharks. While diving is possible around the entire island, the west side is particularly active with marine life. Depending on currents, divers often begin at the northern tip, drifting south along the west coast to explore the vibrant wall and sloping reef sections. This captivating site is home to various species, including schools of barracudas—from the smaller big-eye to the larger pickhandle varieties—and curious batfish that often approach divers. Common sightings also include blue-spotted stingrays, porcupinefish, and a rich assortment of other local reef inhabitants. Koh Bida Nai offers visibility that can range from 5 to over 20 meters, influenced by tidal conditions. Currents here are typically mild to moderate, making it accessible for a range of divers. The site features dramatic limestone walls blanketed in colorful soft corals and large orange sea fans, culminating in shallow coral gardens that are vibrant with life. These conditions contribute to an engaging dive environment suitable for both beginner and intermediate skill levels.

Dive site facts: Koh Phi Phi — Bida Nai

Depth

5–30+ m

Current

Mild to moderate

Visibility

5–30 m

Water temperature

28–31°C

Entry

Boat

Level

Beginner to intermediate

Dive type

Wall, reef, drift

Region / port

Koh Phi Phi, Andaman Sea

Coordinates

7.615, 98.748

Conditions & Currents

Currents at Koh Bida Nai can range from mild to moderate, with conditions heavily influenced by tidal phases. During a half moon, currents tend to be milder, making dives more relaxed and suitable for beginners. Conversely, stronger tidal periods can increase current strength, particularly along the walls and northern tip. Dive operators frequently check conditions using resources like Windguru and local tide tables to select the best dive plan for the day, often starting at the northern tip and drifting south along the west coast. Visibility typically ranges from 5 to 20+ meters but can reach up to 30 meters during peak season, depending on current and weather. Divers should be prepared for varying conditions, and those with less current experience may find sheltered areas more comfortable.

Marine life & sighting chances

Blacktip reef shark

occasional

Leopard shark

occasional

Turtle

occasional

Barracuda

common

Batfish

common

Lionfish

common

Nudibranch

occasional

Shrimp

occasional

Moray eel

common

Blue-spotted stingray

occasional

Cuttlefish

occasional

Squid

occasional

Dive profile & how the dive runs

A typical dive at Koh Bida Nai often begins at the northern tip of the island, allowing divers to drift south along the more marine life-rich west coast. The initial phase involves descending along a sheer wall that drops to depths exceeding 20 meters, covered in vibrant hard and soft corals. This wall gradually transitions into a gently sloping sandy bottom where impressive large sea fans thrive. Further south, the wall gives way to a beautiful sloping reef in shallower sections, often frequented by blacktip reef sharks. Schools of barracudas and curious batfish are commonly encountered in the blue. The dive concludes with a safety stop over the shallow reef on the east side, where a variety of smaller reef fish can be observed.

Underwater photography

Koh Bida Nai offers excellent opportunities for both wide-angle and macro photography. For wide-angle shots, focus on the dramatic limestone walls adorned with colorful soft corals and large sea fans, especially along the west side. Capture the expansive schools of barracudas or the curious batfish in the blue. A dome port is highly recommended to enhance these compositions. For macro enthusiasts, explore the cracks and crevices in the walls and reef for nudibranchs, shrimps, and other small reef inhabitants. Maintain excellent buoyancy to avoid disturbing delicate corals and marine life, particularly in shallower areas. When photographing sharks, avoid using strobes if possible, as they may startle the animals and cause them to swim away.

Combine with nearby dive sites

• Koh Phi Phi — Bida Nok

  Sister island with similar marine life and topography, often dived together.

• Shark Point

  A marine sanctuary known for leopard sharks and colorful anemones, accessible from Phi Phi.

• King Cruiser Wreck

  A passenger ferry wreck that sank in 1997, now an artificial reef teeming with fish life.

• Hin Daeng

  Renowned for its vibrant red soft corals and pelagic encounters, including manta rays and whale sharks.

• Hin Muang

  Features stunning purple corals and attracts large pelagic species like whale sharks and manta rays.

• Koh Haa — The Chimney

  Known for its unique swim-throughs and crystal-clear waters.

Getting there & logistics

Diving at Koh Bida Nai is primarily arranged through dive centers located in Koh Phi Phi. Divers typically travel to Koh Phi Phi by ferry from mainland ports such as Phuket, Krabi, or Koh Lanta. Most dive trips to Bida Nai are day trips, often combined with a dive at its sister island, Bida Nok, or other local Phi Phi sites. Dive boats depart daily from Ton Sai Bay. Liveaboards operating in the Andaman Sea during the high season may also include Bida Nai in their itineraries. National Marine Park fees are applicable for diving within the Phi Phi archipelago and are typically added to the dive trip cost.

Safety & environment

For diving at Koh Bida Nai, it is advisable to have comprehensive dive insurance covering potential medical emergencies and evacuation. The nearest recompression chamber is located in Phuket, necessitating prompt evacuation in case of a serious dive incident. Given the potential for moderate currents, particularly around the northern tip, divers should be comfortable with drift diving techniques and be mindful of their air consumption. Always follow your dive guide's instructions regarding entry points and dive plans. Maintaining good buoyancy control is crucial to protect the abundant soft corals and marine life, as well as to ensure your own safety within swim-throughs and near walls.

Who it suits — and who it doesn't

FAQ

Koh Phi Phi — Bida Nai FAQ

Liveaboards diving Koh Phi Phi — Bida Nai

These liveaboards may visit Koh Phi Phi — Bida Nai on selected itineraries — the exact dive sites depend on departure, weather and conditions.

Mandarin Queen 9

Thailand

26 guests37.5 m

Manta Queen 8

Thailand

24 guests

$127/day

The Junk

Thailand

18 guests33 m

$163/day

Deep Andaman Queen

Thailand

23 guests30.5 m

$194/day

Explorer

Thailand

16 guests25 m

$150/day

Andaman

Thailand

20 guests26 m

$108/day

Stingray

Thailand

8 guests24 m

$245/day

Seatopia

Thailand

24 guests24 m