> ## Content Index > Fetch the complete content index at: https://easythailandvisa.com/llms.txt > Use this file to discover other available public pages before exploring further. # The Mask Is on Your Face and You Can Still See Nothing - URL: https://easythailandvisa.com/thailand-snorkelling-visibility-mask/ - Published: 2026-08-26T13:00:00.000Z - Updated: 2026-10-09T05:38:37.000Z - Description: Snorkelling is the cheapest thing you will do in Thailand and the one where equipment quality changes the experience more than anything else about the trip. - Author: Somchai Jaidee - Tags: Islands & Beaches You put the mask on, you look down, and there is nothing. Not much. A grey-green suggestion of the bottom at four metres, and the reason is not the water and not the depth. It is a piece of moulded plastic with a scratched lens and a dead seal, and it is on your face because it came with the boat. Last verified 5 September 2026. ## The mask is the entire activity **A mask is a frame, a lens, and a silicone skirt that seals to your face.** The skirt is the part that matters and it is the part that is always cheapest, because nobody can tell from a plastic bag. **Test the seal before you go in the water, every time.** Press the mask against your face without the strap and breathe in gently. If it stays on and does not collapse, it seals. If it peels off anywhere, it will leak underwater and you will spend the snorkel repeatedly pushing water out of a mask that will not stay put. **Look through the lens before you buy it.** A good lens is clear and flat. A cheap one has mould flow lines, is slightly warped, and makes everything look like it is behind glass. Hold it up to a light and move your head; a warped lens will swim in the frame. **If you wear glasses, a mask with a prescription insert beats a surface mask every time,** and the surface version is a permanent smear of fogged plastic across the bottom of your vision. **Anti-fog is real but it is temporary.** The usual advice of spitting into the mask works for about twenty minutes. Bring your own, or accept the fog, because fogging is the normal experience and not a fault. ## Fins, and the other thing that matters **Snorkelling fins are either full foot or slipper, and slipper fins are far more useful** unless you are already a competent swimmer, because they take a dive boot and leave room for a reef shoe. **Full-foot fins are almost always too small** for anyone who has not been fitted, and a too-small fin is worse than none, because it cramps your foot and you cannot trim properly. **A short snorkel is safer than a long one** for snorkelling at the surface, and a purge valve is worth having if the water is choppy. ## Where the water is actually clear **Visibility is best in the Andaman on the west coast,** particularly around [Koh Lipe](https://easythailandvisa.com/koh-lipe-and-satun-southern-islands/) and the northern [Phi Phi](https://easythailandvisa.com/phi-phi-islands-what-nobody-tells-you/), and the west side of the islands generally beats the east side, which faces the Gulf and the Chao Phraya outflow. **The Andaman side is also the monsoon side,** so the clear water and the best diving coincide with the season when the sea is roughest at the surface. In short, the best underwater visibility in Thailand and the calmest surface do not happen at the same time of year, and the dive boats that operate do it precisely because they know that the crossing is rough and the diving is not. **The Gulf side,** [**Koh Samui**](https://easythailandvisa.com/getting-to-koh-samui-without-flying/)**,** [**Koh Phangan**](https://easythailandvisa.com/koh-phangan-island-guide-full-moon-party/) **and Koh Tao, is calmer in summer and murkier.** The water is warm all year and this is where most people learn to snorkel, because a lot of it is shallower than 6 metres and it is a gentle place to find out whether you are comfortable with your face in water. ## Getting hurt, which is the boring part that matters **Fire coral looks like a harmless dead branch and cuts deeply.** This is the single most common snorkelling injury in Thailand and it is avoidable by simply not touching anything, which is a rule that is very hard to remember at depth. **Crown-of-thorns starfish, lionfish, sea urchins, and cone shells** are all present, and all of them hurt, and none of them are aggressive. The rule is hands-off, always, including where the water is so shallow you could stand. **Jellyfish are seasonal and locally specific.** Box jellyfish season on the Andaman coast has real closures and real advice from local authorities, and the advice is to wear a rash guard, which is thick enough to stop a sting and thin enough to swim in. **Never snorkel alone, and never in water deeper than you can comfortably swim.** You are a snorkeller, not a diver. If you want to see the reef at depth, take a course rather than holding your breath and going further. ## Current, which is the real danger **Most of the serious snorkelling accidents in Thailand are currents, not animals, and not reefs.** A channel between two islands can move water fast enough that a person in a float jacket is carried out of sight in a few minutes. **Ask the boat operator where the current runs and when.** A good one will tell you honestly, and a good one will also tell you when to go somewhere else. A bad one says the water is calm because you have just committed to a boat. **If caught in one, swim parallel to the current rather than against it,** exactly as you would with a rip, because that is the same phenomenon and the same answer works. Snorkelling costs about the price of a bowl of noodles for the gear, or a few hundred baht for a day on a boat. It is the cheapest marine activity available and the one where the difference between a good mask and a bad one is the difference between seeing a reef and seeing a grey field. Check the seal, check the lens, and ask about the current. Everything else is detail. **More on this** - [The East Coast Has a Moon Rabbit and Almost No Tourists](https://easythailandvisa.com/chanthaburi-and-trat-the-east-coast-day-trip/) - [A Sea Snake in Thailand Is Almost Certainly Not Going to](https://easythailandvisa.com/jellyfish-and-sea-snakes-in-thailand/) - [The Jet Ski Damage Scam Is a Whole Industry and Knowing It](https://easythailandvisa.com/jet-ski-and-beach-club-scams-in-thailand/)