A Morning on the Water Out of Sihanoukville
When Priya from our BugBitten team stepped aboard a skippered catamaran at Sihanoukville's working harbour just after six in the morning, the port was already loud — fishing longtails coughing diesel smoke, a container truck reversing through a gap that seemed far too narrow for it, and a handful of Cambodian dockworkers sharing a thermos of something hot near the fuel pontoon. The boat smelled of salt and old teak. The skipper, a weathered Khmer man who'd been running these waters for the better part of two decades, said almost nothing. He handed Priya a coffee in a chipped mug and pointed southwest, where the sky over the Gulf of Thailand was turning from charcoal to a pale, washed-out amber.
By seven they were past the harbour entrance and the noise had gone. The northeast monsoon was doing exactly what it promises between November and April — a steady, warm push from the right quarter, maybe fourteen knots, nothing dramatic. The boat leaned gently and found its groove. Within twenty minutes, Sihanoukville's increasingly strange skyline — a cluster of unfinished concrete towers that tell a complicated recent story — had shrunk to a smudge on the horizon, and ahead of them lay the low green bulk of Koh Rong, roughly twenty-two nautical miles out.
That morning set the tone for everything that followed. Sailing in the Koh Rong archipelago is not polished. It is not the Whitsundays or the Dodecanese. But it offers something those places have largely lost: a genuine sense that you are figuring out a place that hasn't been fully figured out yet.
What Makes This Stretch of Water Worth Your Time
The Gulf of Thailand between the Cambodian coast and the Koh Rong archipelago occupies a particular category of sailing ground — not technically demanding, not dotted with superyacht marinas, but quietly extraordinary in ways that reward the patient traveller.
The northeast monsoon delivers consistent ten-to-eighteen-knot winds from November through to about mid-April, giving you reliable beam reaches across water that runs warm even in the cooler months. Sea temperatures sit around 28 to 30 degrees Celsius for most of the dry season, which means you will swim, often and without hesitation. The water clarity, particularly around Koh Rong Sanloem's southern and eastern shores, is the kind that makes snorkelling feel almost overwhelming — coral bommies, reef fish in number, and a visibility that can stretch past fifteen metres on a good day.
What genuinely sets this region apart, though, is the bioluminescence. Anchor off Koh Rong's Long Set Beach after dark, slip over the side, and move your hands through the water. The blue-green light that blooms around your fingers and wrists is not something a photograph can communicate properly. It is one of those things that just works on you directly, in a way that's hard to explain afterwards. Plankton, science says. Magic, your brain insists.
The sailing itself is accessible. Passages between the main islands run twenty to thirty nautical miles, which means comfortable day hops with time to anchor, swim, and eat before the sun goes down. Depths across most of the archipelago average eight to fifteen metres, making anchoring forgiving — though the northern approaches to Koh Rong Sanloem carry shallower patches that deserve attention on the charts. There are no big swells to speak of, no dramatic tidal ranges, no exposed open-ocean passages. It is frontier sailing in the sense that the infrastructure is still catching up, not in the sense that it will test your nerves.
How the Area Feels on the Ground
Sihanoukville is a complicated place to arrive in. For anyone who visited before around 2017, the transformation is jarring — a Chinese investment boom reshaped much of the town, and the subsequent pullback left a lot of unfinished construction and a somewhat fractured atmosphere. The waterfront has improved in patches; the market is alive and useful; but the city doesn't invite you to linger. Most sailors treat it purely as a provisioning base and departure point, which is a fair approach.
The islands themselves are a different world. Koh Touch village, on Koh Rong's western shore, manages to be both chaotic and cheerful at once — longtail boats tying up alongside each other in the small bay, plastic chairs and grills right on the sand, cold Angkor beer appearing almost before you've sat down. It is loud in the afternoons, busy with day-trippers and backpackers who've come over on the ferry, and then surprisingly quiet after ten at night when the generators cut out.
Saracen Bay on Koh Rong Sanloem has a different energy entirely. The bay is calm, sheltered, and wide, the water a shade of blue that seems slightly too good to be real. A handful of low-key resorts line the eastern shore, and local fishing longtails move in and out with a kind of relaxed purpose that makes the whole bay feel unhurried. This is where Priya chose to spend two nights, anchored fifty metres off the beach, and she reported that both mornings began with absolute silence and a sunrise that coloured the water copper and rose. There are worse ways to start a day.
The broader context of Cambodia is worth keeping in mind as you travel. If you are planning to add cultural stops to either end of your sailing trip, Angkor Wat remains one of the most extraordinary historical sites in Southeast Asia — a half-day flight or long overland journey from Sihanoukville, but worth building into a longer itinerary.
What to Actually Do Out Here
Sailing and Anchorages
The standard loop for a five-to-seven day charter runs from Sihanoukville to Koh Rong, across to Koh Rong Sanloem, possibly as far south as Koh Sdach or Koh Totang depending on wind and appetite, and then back. Most skippers are happy to adapt based on conditions and mood. The sailing itself occupies maybe three to four hours of each day; the rest is yours.
Anchoring options are genuinely plentiful. Saracen Bay on Sanloem is the most popular overnight spot for good reason — well-protected, beautiful, and deep enough to swing comfortably. Koh Rong's Long Set Beach, on the northern side of the island, is the place for bioluminescence and is usually quieter than the Koh Touch side. Further south, Koh Totang is barely developed and rewards those who make the longer passage with near-total solitude and a reef that sees very few visitors.
Snorkelling and Swimming
Pack your own mask if you care about fit — hire equipment exists on the islands but quality is variable. The best snorkelling sits around Sanloem's southern tip and around the smaller, less-visited islands on the southern fringe of the archipelago. Bring reef-safe sunscreen and use it; the sun at this latitude through clear water is genuinely aggressive.
Eating and Drinking on the Islands
Fresh seafood grilled over charcoal, eaten at a plastic table on the sand, is both the cheapest and the most satisfying meal on offer. Koh Touch has several options running from early afternoon into the evening. Prices are low by any measure — a plate of grilled fish and rice with a beer will rarely set you back more than five or six US dollars. On the boat itself, provisioning from Sihanoukville's market covers the basics well: fresh produce, eggs, tinned goods, good mangoes when in season.
When to Go and When to Give It a Miss
November through February is the window. Winds are most consistent, skies are typically clear, and the swell is negligible. March and April still work but winds can become lighter and patchier as the monsoon begins to wind down, and temperatures push up hard — thirty-five degrees on deck with little wind is uncomfortable in a way that goes beyond inconvenience.
May is marginal. The southwest monsoon starts to assert itself from roughly mid-May, bringing squally conditions, uncomfortable swell, and the start of the rainy season proper. June through October is not charter season by any reasonable definition — strong winds, heavy rain, difficult seas, and most operators stand down their boats entirely.
Anyone visiting the region in the dry season who wants to understand the broader ecology and marine environment of the Gulf of Thailand would do well to spend some time with resources from the UNESCO World Heritage Centre, which provides context on Southeast Asia's coastal and marine heritage zones, some of which border Cambodia's waters.
For those considering extending a Southeast Asian sailing trip, the comparison with nearby options is worth making. Vietnam's Phu Quoc and Gulf Islands offer a more developed charter infrastructure with different but equally rewarding conditions — a useful alternative or a logical extension if you have the time.
How to Get There and Nearby Stops
Getting to Sihanoukville: Direct flights connect Sihanoukville with Bangkok, Kuala Lumpur, and several Chinese cities. From Phnom Penh, a bus takes roughly four hours along Route 4; private taxis or minivans are faster and more comfortable for around twenty-five to thirty US dollars. The road is in decent shape.
Charter logistics: Bareboat options are genuinely limited in this region, and most visitors go skippered — which is, frankly, the sensible choice given that local knowledge about fuel stops, fishing trap locations, and informal anchorage etiquette is worth more than any chart. A handful of operators work out of Sihanoukville's main harbour; BugBitten recommends booking well ahead during peak season (December to January) as the fleet is not large. A local agent to handle port formalities is worth every riel — budget half a day and a modest fee, and don't try to navigate the paperwork solo.
Nearby stops worth your time: Kampot, roughly two hours east along the coast, is a quieter, more relaxed town with good food and a pleasant riverine atmosphere. It makes an excellent bookend for a sailing trip. Phnom Penh is a four-to-five hour drive and rewards a two-night stop for anyone interested in Cambodia's history and culture. For those wanting to explore further, there are well-structured Tours in Cambodia that combine coastal sailing with inland cultural itineraries.
What to bring: High-SPF sun protection — and more of it than you think you need. A hat with a chin strap. Polarised sunglasses. A dry bag for anything electronic. US dollars in small denominations (Cambodia uses USD widely alongside the riel). Light but long-sleeved layers for evenings. Reef-safe sunscreen. A head torch for night swims and dark anchorages.
The Not-So-Good Bits
There is no point pretending this is a refined sailing destination. Sihanoukville as a base port is functional at best and dispiriting at worst — the city's recent history has left visible scars, and navigating the harbour involves patience with bureaucracy and a certain tolerance for chaos. The charter fleet is small, maintenance standards vary between operators, and you should inspect any boat carefully before committing.
Plastic waste is a genuine and ongoing problem. Beaches that look pristine from the boat can carry tide lines of rubbish, particularly after any rainfall pushes debris from inland areas into the sea. This is improving in places where community clean-up efforts have taken root, but do not arrive expecting immaculate shorelines at every anchorage.
Some of the resort and guesthouse development on Koh Rong's busier western shore has happened quickly and without much planning — construction noise, murky water near boat landings, and a general sense of a place being built faster than it can absorb the change. Saracen Bay and the southern islands have so far avoided the worst of this.
Fuel stops require local knowledge and sometimes a willingness to wait. There is no marina in the conventional sense. And the UNESCO World Heritage List serves as a reminder of just how much of the region's natural and cultural heritage is still inadequately protected — the reefs here are under real pressure from overfishing and development, and the long-term picture is uncertain.
These are real limitations. They are also part of what makes this place feel like something worth visiting now, before it becomes something else entirely.
Final Word from the BugBitten Team
The Koh Rong archipelago is not going to give you a pampered week on a gleaming charter yacht with a cocktail menu and Wi-Fi. What it will give you is water so clear you can count the fish below the keel, nights where the sea glows around your hands, mornings of complete quiet broken only by a kingfisher crossing the bay, and the specific satisfaction of being somewhere that still requires a little effort to reach and navigate.
The northeast monsoon window from November through May is the frame. A skippered charter — even a modest one — is the right vehicle. A good local skipper is the key that opens everything else.
Go with patience, go with good sunscreen, and go before the rest of the world fully catches on. The Gulf of Thailand in its Cambodian stretch is genuinely worth the rougher edges, and Priya would tell you the same over a cold Angkor beer any night of the week.
