# Genkai Undersea Observatory Tower, Japan: what it is and when to go > Genkai Undersea Observatory Tower is a visitor attraction (玄海海中展望塔) in Japan. Interests: With kids and Wildlife. The best time to visit is February to May and October to November. In June there are 14 h 13 of daylight, and in December, 9 h 47. 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/genkai-undersea-observatory-tower/ - Reviewed on: 2026-10-02 - Language: en ## In a nutshell - **What it is:** Activity · With kids, Wildlife - **Local name:** 玄海海中展望塔 - **Where:** Japan - **Best time:** February to May and October to November. - **Nearest airport:** FUK Fukuoka, 56 km as the crow flies - **Opening hours:** Apr-Sep 09:00-18:00; Oct-Mar 09:00-17:00 - **Website:** [hadomisaki.jp](https://hadomisaki.jp/) - **Coordinates:** 33.55595, 129.8523 ## What it is and where Genkai Undersea Observatory Tower is a visitor attraction (玄海海中展望塔) in Japan. Its coordinates are 33.55595, 129.8523; the nearest main airport is Fukuoka Airport (FUK, Fukuoka), 56 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=33.555954%2C129.852299) - [Directions](https://www.google.com/maps/dir/?api=1&destination=33.555954%2C129.852299) It is one of the [With kids](https://kokai.app/en/paises/asia/japon/familia/) and [Wildlife](https://kokai.app/en/paises/asia/japon/fauna/) 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 Genkai Undersea Observatory Tower is **February to May and October to November**. | Mes | Época | Hours of daylight | | --- | --- | --- | | January | Possible | 10 h | | February | Best time | 10 h 48 | | March | Best time | 11 h 45 | | April | Best time | 12 h 50 | | May | Best time | 13 h 44 | | June | Possible | 14 h 13 | | July | Possible | 14 h 01 | | August | Possible | 13 h 15 | | September | Possible | 12 h 12 | | October | Best time | 11 h 08 | | November | Best time | 10 h 14 | | December | Possible | 9 h 47 | In June there are 14 h 13 of daylight, and in December, 9 h 47. 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. | What you come for | Best time | Possible | | --- | --- | --- | | With kids | February to May and October to November | December to January and June to September | | Wildlife | April to May and October | November to March and June to September | It is not the same trip whatever you come for: Genkai Undersea Observatory Tower has a different season depending on what you want to do here, and [Kokai](https://kokai.app/en/) puts it in the right month for you. 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 - [Saga Prefectural Nagoya Castle Museum](https://kokai.app/en/paises/asia/japon/saga-prefectural-museum-of-nagoya-castle/): Museum in Karatsu, Saga, Japan · 3.6 km - [Nagoya Castle](https://kokai.app/en/paises/asia/japon/nagoya-castle-ruins/): Japanese castle located in Hizen province (now Saga prefecture) · 3.9 km - [Genkaicho Next Generation Energy Park](https://kokai.app/en/paises/asia/japon/genkaicho-next-generation-energy-park/): With kids · 4.7 km - [Genkai Energy Park](https://kokai.app/en/paises/asia/japon/genkai-energy-park/): With kids · 4.8 km - [Yakataishi no Nanatsugama](https://kokai.app/en/paises/asia/japon/nanatsugama/): Sea cave on the coast of Karatsu, Saga, Japan · 7.4 km Distances are as the crow flies. Everything else is in [the Japan guide](https://kokai.app/en/paises/asia/japon/). ## More in Japan: With kids - [Tokyo Disneyland](https://kokai.app/en/paises/asia/japon/tokyo-disneyland/): theme park in Japan, owned by The Oriental Land Company - [Universal Studios Japan](https://kokai.app/en/paises/asia/japon/universal-studios-japan/): theme park in Osaka, Japan - [Ueno Zoo](https://kokai.app/en/paises/asia/japon/zoologico-imperial-de-ueno/): zoo in Tokyo, Japan - [Okinawa Churaumi Aquarium](https://kokai.app/en/paises/asia/japon/acuario-churaumi-de-okinawa/): aquarium in Okinawa, Japan - [Osaka Aquarium Kaiyukan](https://kokai.app/en/paises/asia/japon/acuario-de-osaka-kaiyukan/): aquarium in Osaka, Japan - [Jigokudani Monkey Park](https://kokai.app/en/paises/asia/japon/jigokudani-monkey-park/): hot springs area with large population of wild snow monkeys Every Japan place under With kids, each with its season, is on [its page](https://kokai.app/en/paises/asia/japon/familia/). ## Frequently asked questions ### What is Genkai Undersea Observatory Tower? It is a visitor attraction (玄海海中展望塔 in the local language) in Japan. ### When is the best time to visit Genkai Undersea Observatory Tower? February to May and October to November. In June there are 14 h 13 of daylight, and in December, 9 h 47. ### How do you get to Genkai Undersea Observatory Tower? The nearest main airport is Fukuoka Airport (FUK), 56 km as the crow flies. From there, [directions](https://www.google.com/maps/dir/?api=1&destination=33.555954%2C129.852299) 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 [Saga Prefectural Nagoya Castle Museum](https://kokai.app/en/paises/asia/japon/saga-prefectural-museum-of-nagoya-castle/), [Nagoya Castle](https://kokai.app/en/paises/asia/japon/nagoya-castle-ruins/), [Genkaicho Next Generation Energy Park](https://kokai.app/en/paises/asia/japon/genkaicho-next-generation-energy-park/). The rest is in [the Japan guide](https://kokai.app/en/paises/asia/japon/). Data from [OpenStreetMap](https://www.openstreetmap.org/way/704120699), licensed under the ODbL. Daylight hours are calculated from the latitude. More in [credits](https://kokai.app/en/aviso/#creditos).