Koai Tamei, Water reservoir and detention basin in Katsushika-ku and Misato, Japan.
Koai Tamei is a water management facility in Katsushika-ku and Misato featuring channels and basins that direct flow across eastern Saitama Prefecture. The system connects multiple waterways and adjusts their movement depending on seasonal conditions.
Izawa Yasobee started building this facility in 1729 to reduce flooding in the Nakagawa Basin. The project was an early solution for water control in an already densely settled region.
The place shows how water could be managed in areas where many people live close together. Local residents see it as a connection between their daily lives and the landscape they depend on.
The facility is reachable from Tokyo using local trains and buses, with several spots where you can look out and see the water system. These observation areas let you understand how the channels work together.
This facility works as a dual system, holding water during dry times and catching overflow during heavy rains. This two-part function in one structure shows the thoughtful design from the Edo period.
The community of curious travelers
AroundUs brings together thousands of curated places, local tips, and hidden gems, enriched daily by 60,000 contributors worldwide.
Misato Park
222 m
Katsushika Niijuku Future Park
2.1 km
Iizuka Bridge
2.1 km
Tōsen-ji
947 m
Konren-in temple
1.8 km
水元中央公園
1.3 km
Tōkō-ji
1.4 kmHenjō-in
1.1 km
Kōzō-ji
1.7 km本隆寺
947 m瑞正寺
1.2 km長伝寺
557 m
Enmei-ji
457 mEnshouzi
2.1 km
Kanzō-ji
1.6 km大雄寺
1.6 km
Raikō-ji
2.1 km
Renzō-in
732 mDaizyouin
2.1 km
Tōkō yōchien
1.4 km
Koaikamichō jidō yūen
556 m
Kōzō-ji
604 m
Jōkō-ji
1.7 km
金蓮院愛染明王石像
1.8 km
Edogawa Bridge
2.2 km
Katsushika Bridge
2.1 km
Kanamachi-yu
2.3 km
Katsushika Ōhashi Bridge
2.1 kmDiscover hidden gems everywhere you go!
From secret cafés to breathtaking viewpoints, skip the crowded tourist spots and find places that match your style. Our app makes it easy with voice search, smart filtering, route optimization, and insider tips from travelers worldwide. Download now for the complete mobile experience.
A unique approach to discovering new places❞
— Le Figaro
All the places worth exploring❞
— France Info
A tailor-made excursion in just a few clicks❞
— 20 Minutes