Tateyama Caldera Sabo Museum

This museum near Tateyama Station focuses on the geology of the Tateyama Caldera and the ongoing engineering effort to manage the sediment it releases. The caldera's walls still shed vast amounts of material carried downstream by the Joganji River toward Toyama Plain. An 1858 earthquake triggered catastrophic landslides that temporarily dammed the river, and the resulting flood devastated communities below. The museum explains the sabo erosion-control works that began in 1906 and continue today. Tours of the active dam sites inside the caldera run twice weekly from July through October.