# Akai River Caldera Onsen and Recreation Center, Japan: what it is and when to go > Akai River Caldera Onsen and Recreation Center is a hot spring bath (赤井川カルデラ温泉;保養センター) in Japan (Otaru). Interests: Hot springs. The best time to visit is February to May and October to November. In June there are 15 h 10 of daylight, and in December, 8 h 50. Here is what it is, where it lies, when to come, how to get there and what else is nearby to turn it into a trip. - Address: https://kokai.app/en/paises/asia/japon/akai-river-caldera-onsen-and-recreation-center/ - Reviewed on: 2026-10-02 - Language: en ## In a nutshell - **What it is:** Hot spring bath · Hot springs - **Local name:** 赤井川カルデラ温泉;保養センター - **Where:** Japan - **Best time:** February to May and October to November. - **Nearest airport:** CTS Sapporo, 79 km as the crow flies - **Coordinates:** 43.08104, 140.81227 ## What it is and where Akai River Caldera Onsen and Recreation Center is a hot spring bath (赤井川カルデラ温泉;保養センター) in Japan (Otaru). It is in [Otaru](https://kokai.app/en/paises/asia/japon/otaru/), where this site lists 21 more places to see, 18 km from the centre. Its coordinates are 43.08104, 140.81227; the nearest main airport is New Chitose Airport (CTS, Sapporo), 79 km as the crow flies. How to get around Japan (train, car, bus) is covered in [its country guide](https://kokai.app/en/paises/asia/japon/#moverse). - [Where it is](https://www.google.com/maps/search/?api=1&query=43.081036%2C140.812269) - [Directions](https://www.google.com/maps/dir/?api=1&destination=43.081036%2C140.812269) It is one of the [Hot springs](https://kokai.app/en/paises/asia/japon/termal/) places in Japan. In [Kokai](https://kokai.app/en/) it is already on your trip map next to the places you save yourself, and it goes into a day's plan with one tap. ## When to go The best time to visit Akai River Caldera Onsen and Recreation Center is **February to May and October to November**. | Mes | Época | Hours of daylight | | --- | --- | --- | | January | Possible | 9 h 09 | | February | Best time | 10 h 18 | | March | Best time | 11 h 39 | | April | Best time | 13 h 11 | | May | Best time | 14 h 28 | | June | Possible | 15 h 10 | | July | Possible | 14 h 53 | | August | Possible | 13 h 46 | | September | Possible | 12 h 17 | | October | Best time | 10 h 47 | | November | Best time | 9 h 28 | | December | Possible | 8 h 50 | In June there are 15 h 10 of daylight, and in December, 8 h 50. Daylight hours are calculated from the site's latitude for the 15th of each month; when planning a full day on foot they matter as much as the weather. When to go to Japan in general, with its festivals and peak seasons, is in [its country guide](https://kokai.app/en/paises/asia/japon/#cuando-ir). ## Before you go to Japan To enter Japan there are 10 things to sort out before you leave, starting with “A valid passport covering your whole stay”: they are all, with their deadlines, in [the Japan checklist](https://kokai.app/en/paises/asia/japon/#antes-de-salir). Currency: Japanese yen (JPY); plugs: Type A and B · 100 V · 50/60 Hz (you need an adapter); emergencies: 110 police · 119 ambulance and fire. In [Kokai](https://kokai.app/en/) you tick off the checklist inside your trip, and each item reminds you when it is time to do it. ## What is nearby - [Consadole Niki Ski Park](https://kokai.app/en/paises/asia/japon/consadole-niki-ski-park/): Ski resort · 7.4 km - [Yoichi distillery](https://kokai.app/en/paises/asia/japon/yoichi-distillery-nikka-whisky/): Building in Yoichi, Hokkaido Prefecture, Japan · 12 km - [Kiroro Snow World](https://kokai.app/en/paises/asia/japon/kiroro-resort/): Japanese ski resort · 16 km - [Mount Tengu](https://kokai.app/en/paises/asia/japon/mount-tengu/): Mountain in Otaru, Japan · 16 km - [Otaru Tenguyama Ski Resort](https://kokai.app/en/paises/asia/japon/otaru-tenguyama-ski-area/): Ski resort · 17 km Distances are as the crow flies. Everything else is in [the Japan guide](https://kokai.app/en/paises/asia/japon/). ## More in Japan: Hot springs - [Jigokudani Monkey Park](https://kokai.app/en/paises/asia/japon/jigokudani-monkey-park/): hot springs area with large population of wild snow monkeys - [Dōgo Onsen](https://kokai.app/en/paises/asia/japon/dogo-onsen/): hot spring in the city of Matsuyama, Ehime Prefecture on the island of Shikoku, Japan - [Obusuma Station](https://kokai.app/en/paises/asia/japon/obusuma/): railway station in Yorii, Osato district, Saitama prefecture, Japan - [Hachigata Station](https://kokai.app/en/paises/asia/japon/hachigata/): railway station in Yorii, Osato district, Saitama prefecture, Japan - [Ohanabatake Station](https://kokai.app/en/paises/asia/japon/ohanabatake/): railway station in Chichibu, Saitama prefecture, Japan - [Awazu Onsen](https://kokai.app/en/paises/asia/japon/awazu-onsen-soyu/): building in Ishikawa Prefecture, Japan Every Japan place under Hot springs, each with its season, is on [its page](https://kokai.app/en/paises/asia/japon/termal/). ## Frequently asked questions ### What is Akai River Caldera Onsen and Recreation Center? It is a hot spring bath (赤井川カルデラ温泉;保養センター in the local language) in Japan. ### When is the best time to visit Akai River Caldera Onsen and Recreation Center? February to May and October to November. In June there are 15 h 10 of daylight, and in December, 8 h 50. ### How do you get to Akai River Caldera Onsen and Recreation Center? The nearest main airport is New Chitose Airport (CTS), 79 km as the crow flies. From there, [directions](https://www.google.com/maps/dir/?api=1&destination=43.081036%2C140.812269) opens the route on the map, and how to get around Japan is explained in [its country guide](https://kokai.app/en/paises/asia/japon/#moverse). ### How do I add it to my trip? With one tap. In Kokai it is already on the Japan map, next to the places you save yourself: add it to a day's plan, give it a time and, if you like, get a reminder when you pass nearby. ### What else is around here? Nearby you have [Consadole Niki Ski Park](https://kokai.app/en/paises/asia/japon/consadole-niki-ski-park/), [Yoichi distillery](https://kokai.app/en/paises/asia/japon/yoichi-distillery-nikka-whisky/), [Kiroro Snow World](https://kokai.app/en/paises/asia/japon/kiroro-resort/). The rest is in [the Japan guide](https://kokai.app/en/paises/asia/japon/). Data from [OpenStreetMap](https://www.openstreetmap.org/way/666607541), licensed under the ODbL, and from [Wikidata](https://www.wikidata.org/), CC0. Daylight hours are calculated from the latitude. More in [credits](https://kokai.app/en/aviso/#creditos).