Paid Observation Decks · Choshi
Chikyu no Maruku Mieru Oka Observatory 地球の丸く見える丘展望館
Hilltop rooftop deck in Choshi where the 330-degree Pacific horizon looks visibly curved; Mt Fuji can be seen 194 km away at sunset.
HoursApr-Sep 9:00-18:30; Oct-Mar 9:00-17:30 (last entry 30 min before; open until sunset on clear days)
ClosedOpen daily (bad-weather closures)
PriceAdult: ¥420
Elementary / junior high: ¥200
65+: ¥360
Combined with Choshi Port Tower (adult): ¥700
Elementary / junior high: ¥200
65+: ¥360
Combined with Choshi Port Tower (adult): ¥700
Getting thereChoshi Electric Railway Kasagami-Kurohae, 15 min walk; Choshi Station by taxi
Time needed30-45 min
Best timeSunset; Diamond Fuji in late Feb and mid-Oct
Address1421-1 Tennodai, Choshi, Chiba
About
On Atagoyama hill near Cape Inubo, this observatory's rooftop gives a near 360-degree view in which the ocean horizon appears to curve, hence the name 'hill where the earth looks round'. You also see the Byobugaura cliffs and, in good conditions, the silhouette of Mt Fuji 194 km away. The 2nd floor has Choshi Geopark exhibits including local amber.
Highlights
- Curved Pacific horizon
- Byobugaura cliffs
- Mt Fuji silhouette and 'Diamond Fuji' in late Feb / mid-Oct
- Geopark and amber exhibits
Tips
- Stays open to sunset on clear days
- Combined ticket with Choshi Port Tower
- Hydrangeas in the park in June
Open in Google Maps · Info checked 2026-10-10
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Open in the appNearby
- Inubosaki LighthousePhoto Spot · 800 m away
- Byobugaura CliffsPhoto Spot · 940 m away
- Sanoya ImagawayakiUnique Store · 3.1 km away
- Donya ShichibeeSushi & Seafood · 3.2 km away
- Choshi Electric RailwayTransit Hub · 3.2 km away
- KyurokuRestaurant · 3.3 km away
- Choshi Tourist Information CenterTourist Info · 3.5 km away
- Choshi Port TowerPaid Observation Decks · 3.9 km away