The first time a sea turtle swam directly underneath me, about two meters below, I forgot how to breathe. Not in a dramatic, cinematic way — I literally forgot. My brain just stopped sending the signal for a few seconds while it tried to process what I was seeing. The turtle, meanwhile, was completely unbothered. It grazed on seagrass, surfaced for air about 40 meters away, and went right back to grazing. I was not part of its story at all.

That was on Ishigaki Island, and it was the moment I realized that Japan — a country most people associate with temples, trains, and technology — is actually one of the best places in the world to swim alongside sea turtles. The water is warm, the reefs are healthy, and the turtles are there year-round.

Here's everything you need to know to do it yourself.

Where to See Sea Turtles in Japan

1. Ishigaki Island — Yonehara Beach

The best spot on Ishigaki for turtle encounters. The reef is close to shore, the water is calm inside the lagoon, and sightings are almost guaranteed between April and October. I've seen turtles here on three out of three visits. Best time: early morning (7-9 AM) before other snorkelers arrive and disturb the water.

2. Zamami Island — Furuzamami Beach

Thirty minutes by ferry from Naha, and the turtles are so common that locals consider them unremarkable. I spoke to one shop owner who said she sees them "every day, like clockwork." The reef at Furuzamami is a designated sea turtle feeding ground, which is about as reliable a recommendation as you can get.

3. Miyakojima — Aragusuku Beach

Aragusuku's shallow reef makes it easy to spot turtles from the surface, and the beach's lower profile (compared to Yonaha Maehama) means fewer visitors and less disturbance. The turtles here tend to be smaller — juveniles, mostly — but they're curious and will often approach snorkelers.

4. Kuroshima (Black Island)

A tiny island near Ishigaki with a population of about 200 people and roughly the same number of nesting sea turtles. Kuroshima is a major nesting site for green sea turtles and hawksbill turtles. If you visit between May and July, you might see turtles coming ashore to lay eggs at night. Guided night walks are available through the island's small visitor center.

A green sea turtle grazing on seagrass — a common sight in Japan's southern islands.

When to Go

The turtle season in Japan's southern islands runs roughly from April through November, with peak activity in the warmer months (June-September). Water temperature during this period is 26-29°C — comfortable for extended snorkeling without a wetsuit.

That said, turtles don't migrate. They're residents. They're in the water year-round, just less active (and harder to spot) in cooler months. I saw a turtle on New Year's Day off the coast of Zamami — it was 20°C water, not exactly tropical, but the turtle didn't seem to mind.

Snorkeling Etiquette (Please Read This)

I need to say this clearly because I've seen too many people get it wrong: sea turtles are wild animals, not props for your Instagram story. They're protected under Japanese law and international convention, and there are specific rules about interacting with them.

• Keep your distance. Stay at least 5 meters away. If a turtle swims toward you, stay still and let it pass. Don't chase it.
• Don't touch. Ever. Not a gentle pat, not a quick stroke. The oils on human skin can damage their shells and skin.
• Don't block their path to the surface. Turtles need to breathe air. If you're between a turtle and the surface, move.
• No flash photography. It disorients them, especially at night.
• Don't feed them. It alters their natural behavior and diet.

What It Actually Feels Like

Magazine articles always describe wildlife encounters with words like "majestic" and "awe-inspiring." Those words aren't wrong, exactly, but they're incomplete. Swimming with a sea turtle also feels a little bit absurd. You're this clumsy land mammal flailing around in an element you're not designed for, and next to you is this ancient, graceful creature that has been perfecting its existence for 100 million years. It doesn't care about you. It doesn't even notice you. And somehow that makes the whole thing more profound.

You'll surface with salt in your mouth and a stupid grin on your face, and you'll want to tell everyone you know. But you'll also feel something quieter — a sense that you were briefly allowed into a world that doesn't belong to you. That feeling stays with you longer than any photo could.