Omaru Onsen (Omaru Onsen Ryokan)

A Hidden Hot Spring Deep in the Nasu Onsen Area

Located at the foot of Mt. Chausu at an altitude of 1,300 meters, Omaru Onsen Ryokan has been preserved by generations of innkeepers for over 200 years. Rich in metasilicic acid, the spring water is known for its moisturizing properties and is often called “Bijin-yu” (Beauty Hot Spring).

The historic Kawa-no-Yu bath draws its water directly from the river source, where hot spring water gushes from the mountainside to form an open-air bath along the river. Here, guests can soak while listening to the gentle murmur of the stream, enjoying the secluded charm of this hidden onsen.

Omaru Onsen’s water, abundant in metasilicic acid, has long been treasured for its skin-beautifying effects. The ryokan features mixed open-air baths such as Shirakaba-no-Yu, Ajisai-no-Yu, and Azami-no-Yu, making it a great choice for families.

The on-site restaurant serves local Nasu vegetables, Tochigi Wagyu beef shabu-shabu, and “Nasuhikari” rice produced in Tochigi. Sake enthusiasts can also try shochu diluted with hot spring water.

During the Meiji period, General Nogi Maresuke visited Omaru Onsen every year for convalescence. The ryokan’s lobby still displays valuable artifacts, including his clothing, diaries, and letters.

Location Map

Basic Information

Address	269 Yumoto, Nasu-machi, Nasu-gun, Tochigi Prefecture
Telephone Number	0287-76-3050
Website	http://www.omaru.co.jp/
Business Hours	Day-trip bathing hours: 11:30~14:30
Price	Day-trip bathing fees: Adults 1,300 yen / Children (ages 3–elementary school) 1,000 yen
DIRECTIONS	From JR Nasushiobara Station (West Exit) or JR Kuroiso Station (West Exit), take a Kanto Bus bound for Nasu Ropeway and get off at “Omaru Onsen,” then walk about 2 minutes.
Map Code	548 748 316*13

Nasu Area

The Nasu area, in the northeastern part of the prefecture, is famous for the imperial villa located there, and is one of Japan’s premier resort areas with its expansive highlands. The climate has allowed the development of a thriving dairy industry, and while there, you can visit a dairy farm that is open to tourists and offers delicious sweets made from milk, such as soft-serve ice cream and cheesecake. There are also many family-friendly facilities like Safari Park, amusement parks, and hot spring facilities like Shiobara Onsen.