Hōzōji Marsh, Natural monument and marsh in Hanyu, Japan

Hōzōji Marsh is a network of artificial ponds built within Hanyū Riverside Park that creates habitats for aquatic plants and animals. Connected pathways allow visitors to move through this water-filled landscape and observe the different zones and their inhabitants.

The site developed from irrigation systems built for farming during Hanyu's regional development in earlier times. It was later transformed into a protected natural area during the 20th century and remains an important conservation site today.

The marsh serves as an outdoor classroom where local students learn about wetland life through direct observation and research activities. This educational purpose shapes how the site is used and cared for by the community.

Marked trails guide you through the area with good stopping points for observation throughout the park. The site is accessible year-round, though different seasons bring different bird species and water conditions to watch.

Researchers regularly study the water composition and ecological shifts happening here as part of ongoing investigations into how climate changes affect Japanese wetlands. This makes the marsh an active research site contributing to broader environmental understanding.