Kasamori Tsurumai Prefectural Natural Park is a Prefectural Natural Park in central Chiba Prefecture, Japan. Established in 1966, the park spans the municipalities of Chōnan, Ichihara, and Nagara. Kasamori-dera is on the Bandō 33 Kannon pilgrimage route; its Kannon Hall is an Important Cultural Property dating to 1597 and related woodlands are a Natural Monument.