Oomurasaki Great Purple Emperor butterfly

See the national butterfly of Japan, inspiration for the town’s mascot “Musashi Ranmaru”, in its natural habitat at this free butterfly park in Ranzan Town.

Dozens of Butterflies at the free butterfly park in Ranzan town

It’s amazing what you learn when you spend your days out and about exploring your adopted second home. Who knew that the Great Purple Emperor “Oomurazaki” Butterfly is the national butterfly of Japan? I didn’t and wouldn’t have, had it not been for our serendipitous visit to the free butterfly park in Ranzan.

Cherry blossom trees in Ranzan town, Saitama Prefecture

We went to see the famous cherry blossoms of Ranzan twice over the spring break. One time we were too early to see them in their full glory, so we ended up scouting the area instead. On this escapade we happened upon Cho No Sato Park. A butterfly and insect park near to the acclaimed Ranzan cherry blossom avenue.

Cho means butterfly. Sato means village or homeland. Cho No Sato Park in Ranzan is referred to in English as the village of butterflies (or the homeland of butterflies) park.

The National Butterfly Of Japan

Ranzan's butterfly park map

I had no idea we had a butterfly park in Ranzan, but by all accounts it is very well known among the botanist and lepidopterologist communities. Hundreds if not thousands of butterfly enthusiasts purposefully make the journey to rural Ranzan annually.

Oomurasaki Forest, the name of the butterfly park in Ranzan town

The reason for its pre-eminence: a chance to catch a glimpse of Japan’s national butterfly. As the butterfly park in Ranzan is one of only a few places in Kanto that you can see the Great Purple Emperor “Oomurazaki” in its natural habitat.

A sign in Japanese saying let's protect our natural environment

Another thing we learned from our excursion is that the Great Purple Emperor needs enoki (hackberry) trees to survive. One of the reasons that the Great Purple Emperor butterfly is so rare in nature these days is due to the lack of enoki trees. Many have been intentionally cut down, possibly due to the great height they reach.

Butterflies, Insects, Beetles and Fireflies

An oomurazaki Great purple emperor caterpillar on a leaf the free butterfly park in Ranzan Town, Saitama prefecture
Great Purple Emperor Caterpillar

Apart from the Purple emperor, there are several other butterflies you can see in the park, if you time it right. The best time to visit is in summer, particularly June when you can see the fireflies and beetles in the area too. Which is right about the time that the stunning lavender of Ranzan are in bloom. And the lavender fields, previously the largest in Japan, are about a 20 minute walk from the butterfly park.

Please note that this park is only for viewing, capturing is strictly forbidden.

Learning about butterflies from a volunteer at Ranzan's butterfly forest aka butterfly park
A volunteer guide helped the kids find the caterpillar

Right now (April 2019) all you can see is caterpillars. As they are so small, you will probably need some guidance to find them. But there are also many other insects native to the area, so with cautious exploring you’re sure to find some creepy crawlies in the woods.

Beetles at the Ranzan Butterfly park

There is a center house which has various displays and information. At the moment 99% of the information is in the Japanese language only, but there are quite a lot of visual displays too. And a volunteer guide is on site at all times to direct you and answer any questions you might have. Again, they mainly speak Japanese only, but they can explain with pictures and gestures.

Walking through the ranzan butterfly forest aka park

The park is quite nice to walk around even if you see no insects at all. It is part of a larger nature reserve. The park is divided by a road, but you can walk through an under road tunnel to get to the far side of the park. There is no playground equipment, but there are some facilities like a rest area and public toilets.


**Please note that it is strictly forbidden to use insect nets or catch any butterfly, beetle or insect in this park**

Hours of the Ranzan butterfly park, Saitama Prefecture

Hours: From April to November the parking and center house is open from 8.30 am to 5 pm on Tuesdays to Sundays, closed on Mondays. In the winter, the park is closed on weekdays.

Phone: 0493-62-0719

Official Website


Address: Senjudo, Ranzan, Hiki District, Saitama 355-0227

About a half hour walk from the Musashi Ranzan Station of the Tobu Tojo Line.

About a 7 minute drive from the Higashimatsuyama Shingo Belc on route 254. Free Parking for about 8 cars.

Ikaruga1127, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

The featured image, also above, is from Wikimedia Commons. Ikaruga1127, CC BY-SA 4.0, via Wikimedia Commons

Also in Ranzan


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