The Andaman Coast

Thailand's Andaman coast is one of the most visually spectacular stretches of shoreline in the world. Running roughly 740 kilometres from the Myanmar border at Ranong southward to Satun near Malaysia, this west-facing coast is defined by towering limestone karst formations, emerald-green waters, dense mangrove forests, and some of the richest coral reef ecosystems in the Indian Ocean.

The Andaman coast faces the open Indian Ocean. This exposure creates stronger currents, deeper waters, and more dramatic seascapes than the calmer Gulf of Thailand on the east. It also delivers the southwest monsoon (May–October), which brings heavy rains and rough seas, closing many islands to tourism during those months. But from November to April, the Andaman coast is one of the finest tropical beach destinations on Earth.

Phang Nga Province — The Karst Kingdom

Phang Nga Bay is the Andaman coast's most iconic landscape. A vast shallow bay studded with hundreds of limestone karst islands — vertical-sided pillars of rock draped in tropical vegetation, rising from impossibly green water. The formations were created over millions of years as limestone dissolved and eroded, leaving behind these extraordinary sea stacks and hongs (collapsed cave systems forming lagoons enclosed by sheer cliffs).

Key sites:

James Bond Island (Ko Khao Phing Kan) — The leaning rock formation made famous by The Man with the Golden Gun (1974). Touristy, but genuinely impressive geology.
Hong Islands — A series of collapsed cave lagoons accessible by kayak through narrow channels. Paddle through darkness into hidden emerald pools surrounded by 360° walls of limestone. Magical.
Ko Panyi — A Muslim fishing village built entirely on stilts over the water, clustered around a limestone outcrop. A floating community of around 2,000 people. Their football pitch — built on floating pontoons — became the subject of a famous Thai commercial.

Khao Lak

North of Phuket, Khao Lak is a more relaxed, family-friendly Andaman coast destination. Long, wide beaches backed by forested hills. It's the gateway to the Similan Islands (80km offshore), and offers quality diving, excellent Thai food, and a fraction of Phuket's crowds. Khao Lak was devastated by the 2004 tsunami — memorials and a police boat carried 2km inland by the wave remain as sombre reminders.

Krabi Province — Limestone Paradise

Krabi is the Andaman coast's adventure capital. The province combines:

Railay Beach — Accessible only by boat (a limestone headland blocks road access), Railay is a crescent of white sand backed by soaring karst cliffs. It's one of the world's top rock climbing destinations, with over 700 bolted routes ranging from beginner to extreme on perfect limestone.
Ao Nang — The main tourist town, with beach-front restaurants, tour operators, and longtail boats to nearby islands.
Tiger Cave Temple (Wat Tham Suea) — 1,237 steps to a mountaintop temple with panoramic views across the karst-studded landscape.
Emerald Pool & Hot Springs — A natural emerald-coloured pool in lowland forest, fed by a hot stream from a thermal spring.

The Four Islands (Koh Poda Group)

A classic Krabi day trip visiting:

Ko Poda — Pristine white beach, good snorkelling
Ko Gai (Chicken Island) — Named for its chicken-head-shaped rock formation
Tup Island — Connected to Chicken Island by a sandbar at low tide
Phra Nang Cave Beach — A stunning beach beneath limestone cliffs, with a cave shrine to a sea princess

Trang & Satun — The Quiet South

The southern Andaman coast remains relatively undiscovered. Trang province offers:

Ko Muk — The Emerald Cave (Tham Morakot): swim through a 80-metre dark cave passage to emerge in a hidden beach enclosed by vertical cliffs open to the sky. One of Thailand's most extraordinary natural experiences.
Ko Kradan — Often cited as having Thailand's most beautiful beach. Long, white, and often near-deserted.
Ko Libong — Thailand's best place to spot endangered dugongs (sea cows) in the wild.

Satun province is the gateway to:

Ko Lipe — Thailand's southernmost resort island. Crystal-clear water, spectacular coral reefs (Walking Street underwater snorkel trail), and a Chao Ley (sea gypsy) community.
Ko Tarutao — A wild, forested island that once served as a political prison camp during WWII. Now a pristine national park with excellent wildlife (monitor lizards, langurs, hornbills) and empty beaches. No nightlife, minimal development — just nature.
Ko Adang & Ko Rawi — Part of the Tarutao archipelago, with jungle hiking and spectacular viewpoints.

Andaman Sea Marine Life

The Andaman coast's deeper, more nutrient-rich waters support exceptional marine biodiversity:

Whale Sharks — Regular visitors to the Similan and Surin Islands, particularly February–April. The largest fish in the sea, growing to 12+ metres.
Manta Rays — Encountered at cleaning stations around the Similan Islands, particularly at sites like Koh Bon.
Leopard Sharks — Bottom-dwelling sharks common at many Andaman dive sites.
Reef Fish — Spectacular density and variety: clownfish, lionfish, parrotfish, moray eels, Napoleon wrasse, barracuda, trevally.
Sea Turtles — Hawksbill and green turtles nest on remote Andaman beaches. Similan Island beaches are important nesting sites (November–February).

Moken Sea Nomads

The Moken (also called Chao Ley or sea gypsies) are an Austronesian people who have lived on the Andaman Sea for centuries as nomadic boat-dwellers. Communities survive on the Surin Islands and at several coastal settlements. The Moken have extraordinary free-diving abilities and an intimate knowledge of the sea that enabled many to survive the 2004 tsunami — recognising the warning signs and fleeing to high ground before the waves arrived.

Their way of life is under threat from modernisation, restricted fishing zones, and tourism, though cultural preservation efforts continue.

Best Time to Visit

The Andaman coast operates on a clear seasonal pattern:

November–April — Dry season. Blue skies, calm seas, excellent visibility. Peak tourist season (December–January busiest).
May–October — Southwest monsoon. Heavy rain, rough seas, strong currents. Many islands close (Similans, Surins, some Phi Phi services). Hotel prices drop significantly. Some travellers enjoy the dramatic stormy weather and deserted beaches.