National Park & Nature

Tone River

📍 Tone River, Ibaraki/Chiba, Japan (mouth at the Kashima-nada between Kamisu and Choshi)

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★★★★☆

Quick Facts

Location: Japan
Category: National Park & Nature
Duration: 1-2 hours (riverside spots)
Opening Hours: Riverbanks and levees are open around the clock; most riverside spots are open all day
Ticket Price: Adult: Free · Bank walks are free; boating, camping and activities are charged by local rules
Address: Tone River, Ibaraki/Chiba, Japan (mouth at the Kashima-nada between Kamisu and Choshi)
Coordinates: 36.3417, 140.4467

Introduction

The Tone River (Tone-gawa) runs about 322 kilometres, the second longest in Japan, and drains 16,840 square kilometres — the largest basin in the country — earning the nickname Bando Taro ('Taro', the eldest son of the old eastern land). It rises on Mount Ominakami (1,831 m) in Minakami, Gunma, crosses the Kanto Plain and meets the Pacific at the Kashima-nada between Kamisu, Ibaraki and Choshi, Chiba. Historically notorious for floods and course changes, it was rerouted east by the Tokugawa shogunate's Tone Eastward Diversion works (1594-1654), freeing the Kanto from inundation; today its upstream dam group is a principal water source for the Tokyo metropolitan area, across 1 prefecture-level metropolis and 5 prefectures serving some 12.79 million people. Cherry rows on the levees, water-country marshscapes and estuary scenery make it the river that explains the Kanto.

✨ Highlights

Japan's Largest Basin

16,840 km2 of drainage area — No.1 in Japan; 322 km long, second only to the Shinano.

Bando Taro

'The great river of the east'; flood-prone enough to also be called the 'raging river'.

The Eastward Diversion

The Tokugawa shogunate's 1594-1654 re-engineering freed the Kanto Plain from floods.

Capital's Water Source

Upstream dams supply the Tokyo metropolitan area, home to some 12.79 million people.

Cherry Rows on the Levees

Levee cherry blossoms and bank paths are a classic Kanto hanami line in spring.

Water Country and Estuary

Marsh towns like Itako and Sawara, and the estuary between Kamisu and Choshi.

🛈 Practical Info

→Location：Flows through Ibaraki, Tochigi, Gunma, Saitama, Chiba and Tokyo, reaching the Pacific between Kamisu and Choshi.

→Duration：1-2 hours at a riverside spot; a full day driving the river's course.

→Note：Stay clear of dangerous banks in the flood season; levees are windy and feel cold — bring a shell.

→Opening Hours：Riverbanks and levees are open around the clock; most riverside spots are open all day

→Transportation：JR Joban/Narita lines to Toride, Moriya or Itako, then transfer; Tone Ohashi bridge connects

Ticket Information

Ticket Information
Adult	Free

Bank walks are free; boating, camping and activities are charged by local rules

💡 Tips

• Riverside sights are scattered; the Toride-Moriya bank parks and the Ibaraki-Saitama cherry levees are the most concentrated.

• The levee cherry blossoms are a classic Kanto hanami line, best from late March to early April.

• Take a small-boat cruise through the marsh towns of Itako and Sawara and pair it with the estuary in one day.

• Boating and camping often need municipal permits and follow seasonal rules — check first.

• After typhoons and in the flood season the current runs fast — keep clear of dangerous banks.

• The Tone is a principal water source for greater Tokyo; the upstream dam group fascinates engineering fans.

FAQ

What are the opening hours of Tone River?

Riverbanks and levees are open around the clock; most riverside spots are open all day

How much is the admission for Tone River?

Adult: Free; Bank walks are free; boating, camping and activities are charged by local rules

Any practical tips for visiting Tone River?

Riverside sights are scattered; the Toride-Moriya bank parks and the Ibaraki-Saitama cherry levees are the most concentrated. The levee cherry blossoms are a classic Kanto hanami line, best from late March to early April.