Savor the water slides and the lazy river until evening

About this spot

An outdoor leisure pool in Sanmu City, Chiba Prefecture (千葉県山武市), operating in 2026 from Saturday, July 4 to Wednesday, September 23 (a public holiday), closed July 6 to 10, July 13 to 17 and on weekdays in September. With water slides and a lazy river, everyone from small children to adults can enjoy it until evening without getting bored. Changing rooms, showers and a shop are all provided, so its appeal is that even first-time families have little to worry about facility-wise. Because it is located close to the Kujukuri coast (九十九里浜), water play here comes with the sea breeze, which sets it apart from other pool facilities. Fees are 2,200 yen for adults, 1,200 yen for high school students, 500 yen for junior high students, 400 yen for elementary students and 200 yen for preschoolers (free for age 3 and under), and some attractions may cost extra.

Season & hours

Tips

Last entry is 15:00 and closing is 17:00, so a time plan of entering around midday and staying until evening is recommended. Changing rooms and showers get crowded at certain hours, so changing early keeps things smooth. Check the official information before your visit to make sure the date is not a closed day (July 6 to 10, July 13 to 17, or a September weekday).

Best time to visit

Entering at noon lets you secure a spot before the peak crowds and enjoy plenty of water play until the 17:00 close

Access & map

Sanmu City · Hasunuma Water Garden (山武市・蓮沼ウォーターガーデン)