Oami Onsen (大網温泉)

Introduction: The Dramatic Gateway to the Shiobara Gorge

At the very entrance of the Shiobara Valley, where the canyon walls are steepest and the roar of the Hoki River most resonant, lies Oami Onsen (大網温泉). [19] This hamlet is defined by its spectacular vertical scenery and serves as the threshold between the modern world and the ancient healing forests of the interior.

For the international explorer, Oami is synonymous with **Yumori Tanaka-ya (湯守田中屋)**, a landmark ryokan that has guarded these waters for generations. The experience here is elemental: to soak in a massive stone bath carved into the side of a cliff, listening to the mountain stream below while being enveloped in the steam of a 1,200-year-old source. Oami is the perfect choice for those who want to feel the raw power of Tochigi’s volcanic landscape from the moment they arrive.

Key Information Table

The Healing Waters: The “Cliffside Purifier”

Oami’s spring is a **Neutral Simple Spring**, which is historically celebrated for its stability. While neighboring Shin-yu treats internal diseases with sulfur, Oami is traditionally used for **skin revitalization and musculoskeletal recovery**. [26, 18] The water emerges at a temperature that requires minimal adjustment, preserving the high volume of dissolved minerals.

The highlight is the **Gensen Kake-nagashi Iwaburo**. The water flows 100% naturally from the cliffside source into the tubs. [27, 9] Because the baths are located right at the river level, the high negative-ion concentration from the rushing water enhances the relaxation effect, making it a “whole-body sensory detox.”

Recommended Stay: Yumori Tanaka-ya

The Yumori Tanaka-ya (湯守田中屋) is the undisputed heart of Oami Onsen. [5, 11]

• The Cliffside Experience: Guests walk down a historic 300-step staircase to reach the riverside baths. Note: This may be challenging for guests with limited mobility.
• Mixed-Gender Culture (Konyoku): Tanaka-ya maintains the traditional mixed-gender open-air bathing culture. [28, 29, 30] In 2025-2026, the inn provides “Yuami-gi” (modesty towels) for female guests, making it approachable for international couples. [27, 30]
• Cuisine: Specializes in “Robata-yaki” (fireside grilling), serving local Iwana trout and Tochigi wagyu over charcoal.

Must-Visit Scenic Spot: The Red Suspension Bridge

Located just minutes from the Oami hamlet, the **Beni-no-tsuribashi** (Red Suspension Bridge) is the most iconic photography spot in the valley. [15, 13] During the peak autumn foliage (late Oct to mid-Nov), the bridge is surrounded by vivid crimson maples that are illuminated at night, creating a surreal “floating” effect over the river.

Practical Travel Tips for International Visitors

• Tattoo Policy: Yumori Tanaka-ya is very welcoming to foreign travelers with tattoos. [31, 28, 32] Small tattoos are generally accepted in public areas, and for larger pieces, the use of private reservable baths is suggested for total comfort. [33]
• Connectivity: Due to the steep canyon walls, mobile signal can be weak near the riverside baths. Use the high-speed Wi-Fi available in the ryokan lobby and guest rooms. [22]
• Mixed Bathing Etiquette: Always wear the provided modesty towel (Yuami-gi) if you are a woman, and avoid staring or direct eye contact—it is a space for quiet contemplation.

2025-2026 Latest Updates

In 2025, Oami Onsen completed a renovation of the riverside “Nadeshiko” bath to improve accessibility and universal design on the lower levels. Additionally, the hamlet is now a designated stop for the “Yu-Bus” tour circuit, allowing easy exploration of the entire Shiobara Eleven Hamlets for a single flat fare.

Safety & Manners

Slippery Surfaces: The stairs to the riverside baths and the rocks around the pools can be very slippery due to mineral buildup. Walk slowly and use the handrails.
Winter Equipment: If visiting between December and February, the spray from the river can freeze on the bridge walkways. Wear shoes with good traction and be aware of the “Nikko-Oroshi” cold winds.