本日締切【3/31〆】国分府台グリーンロード40km｜初心者から40kmに本気で向き合う日

On the west side around Ichikawa and Matsudo, this is a small looped race with a deliberately oddball streak. Kokubun-Fudai Green Road is presented as “a day to seriously face 40 km, starting from beginner level,” which indicates the mood: welcoming, but not soft. It is for runners who are “bored with ordinary road races” and would rather explore the back way than chase a tidy clock time. The course is the main character: “back route x brutal hills,” with enough climbing that the organizers state it is not suited to anyone hunting a record on a flat course. Only 30 runners get in, so expect more shared suffering than big-race anonymity. If you are new but curious about taking a proper bite out of a long, lumpy road day, this sounds like the kind of silly-serious outing where the hills do most of the talking.