The park features eight ancient Kofun burial mounds from the 4th to 7th centuries.
The garden hosts 3,000 hydrangea bushes that bloom annually in June.
It is built atop a topographical terrace known as the Tama River Terrace.
The park contains a specialized kofun exhibition room displaying artifacts from the local tombs.
Tamagawadai Park is situated on a ridge overlooking the Tama River, providing a long, narrow green space that stretches for approximately 750 meters. The park is renowned for its extensive hydrangeas, with approximately 3,000 bushes featuring seven different varieties blooming across the hillside. Archaeologically significant, the park contains the Tamagawadai Kofun group, consisting of eight ancient burial mounds dating back to the Kofun period. The site includes a dedicated exhibition room showcasing excavated pottery and historical artifacts found within the park's grounds. Elevated walkways provide panoramic views of the river basin and the surrounding residential landscape. The park serves as a vital transition zone between the elevated Den-en-chofu neighborhood and the Tama River floodplains. Extensive natural foliage provides a dense canopy, maintaining a distinct micro-climate compared to the adjacent urban areas.
The elevated observation decks overlooking the Tama River during sunset.
Visit during the hydrangea season in early summer for the peak floral display.
Walk the full length of the ridge trail to see both the historical burial mounds and the river viewpoints.
Bring a picnic, as there are designated rest areas located near the botanical displays.
Attempting to climb or touch the ancient Kofun burial mounds, as they are protected archaeological sites.
Stay on marked paths to protect the archaeological burial mounds.
