Muroiwa cave, Matsuzaki

12 June 2026
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Muroiwa cave, Matsuzaki

We kicked off the final day of our Izu road trip with a drive to the Muroiwa cave, which is next to the town of Matsuzaki. This was another one of those random “I saw it on Google Maps”-type finds but it was quite a fun little detour.

Small gravel parking lot beside a winding highway with a rocky cliff face and a white SUV

The parking lot for this one really is quite random. There’s space for maybe 3 - 4 cars on a gravel patch off the highway road. Hope no cars are coming, make a dash across the road, and then you’ll head down to the entrance of the caves.

Route 136 winding through dense green forest with a large rocky cliff face on the left

Before you do though, there’s a sign in Japanese recommending you to bring a flashlight, so it might be good to have one of those handy (or use your phone).

Rocky cave entrance with a Japanese information sign and a narrow stone path leading into the dark interior

The entrance to the cave warns that the lights in the cave only turn on during the daytime from 8:30am. We had a fairly early start and it was like 8:15, but the lights were already on anyway.

Unlike any of the caves you might visit near Tokyo (i.e. full of tourists) this one actually does feel a bit spooky as the lighting is fairly minimal, and there isn’t really anyone else around.

Dimly lit cave interior with a seated stone miner statue against a pale rock face and a lit passage beyond

But what’s even cooler - this cave has BATS.

Dozens of bats roosting on the rocky cave ceiling
🦇🦇🦇
Bats clustered in groups on the cave ceiling with some hanging individually
Hahaaa look at them!!!

So this cave was originally mined for its rock, and one sign noted that the little protruding bits were made of some sort of tougher volcanic rock (?) so they couldn’t actually dig it out.

Cave ceiling with pitted volcanic rock texture and a protruding rocky bump
Dimly lit cave corridor with rope barriers leading to an arched stone tunnel at the far end

Also there’s a couple of statues of people mining in here, which gives you a bit of a jumpscare when you happen upon it.

Cave interior with a standing statue of a shirtless miner holding a tool against a tall rock wall
Cave ceiling showing smooth light-coloured rock with a small cluster of bats in the centre
More bats
Wide cave passage with rough stone walls and a dirt path lined with rope fencing
This part was pretty low so you have to duck

Eventually you’ll make it out of the cave to a small lookout. After mining the quarry for rocks, they would let the rocks roll down the hill here to the bay below.

Hilltop lookout with an information board overlooking a calm coastal bay and forested hills

And you can see Mt Fuji too!

Coastal bay view with green hills, a small town by the water, and a faint Mt Fuji on the horizon
A bit faint, but he's on the left

After that, it’s a short walk up the hill back to the carpark.

Narrow forest path with stone steps climbing through lush green vegetation

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