Awashizenmura Onsen

Awashizenmura Onsen (安房自然村) is a rustic hot spring facility located on the southern tip of the Boso Peninsula in Chiba Prefecture. Part of a larger ryokan complex that emphasizes nature-themed stays, the onsen is best known for its unique hillside aesthetic. A dramatic cave-like tunnel leads from the exterior into the mountain, though it is important to note that this specific entrance is typically reserved for overnight guests; day visitors are usually directed through a separate entrance near the restaurant area.

While the exterior provides an adventurous first impression, the facilities themselves are quite simple and dated. The bathing area consists of two small pools: a scalding indoor bath that frequently reaches temperatures of 45-46°C, and a more temperate outdoor bath kept at roughly 38°C. The “open-air” bath is set deep within a concrete and soil enclosure, offering a secluded but limited view of the surrounding trees. Despite the aging infrastructure and basic changing rooms, the facility remains a popular stop for those touring the coastline by motorbike or car, particularly due to the quality of the on-site dining.

Visitor Information
Address	1101-1 Ito, Tateyama, Chiba 294-0305 (Google Maps)
Opening Hours	10:00 AM – 9:00 PM (Last entry 8:00 PM)
Price	Onsen Only: ¥700 / Lunch + Onsen Combo: ¥1,500
Website	Visit Website

Access
Station / Stop	Line / Bus	Access Details
Tateyama Station	JR Uchibo Line	Take the JR Bus toward Nojimazaki Lighthouse (approx. 25 mins).
Awashizenmura	JR Bus	The ryokan is located immediately adjacent to the bus stop.