Photo: Mauricio V. Genta · CC BY-SA 4.0Boso Peninsula Coast Loop
Cross the Tokyo Bay Aqua-Line from Haneda, circle southern Boso and return over three coastal days.
- Allow
- 3 days
- Route
- 253 km
- Drive time
- 3 hr 55 min
- Stops
- 8
Haneda is the rare Tokyo gateway where a car immediately adds value. The Aqua-Line reaches Umihotaru and Kisarazu before Mount Nokogiri, Tateyama and Nojimazaki lead into the Boso Flower Line’s low southern coast.
Kamogawa and Yoro Valley complete the eastern and inland sides. Typhoons, high wind and heavy rain can close roads and the bay crossing, while holiday traffic can erase the time advantage. Check official highway information and never force the loop when the Aqua-Line is restricted.
The road, in one glance
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Drawing the route…
The route earns
its distance
Each pin is selected as a place to do something—not merely proof that you passed through.
- 01Haneda Gateway
- 02Umihotaru
- 03Mount Nokogiri
- 04Tateyama
- 05Nojimazaki Lighthouse
- 06Kamogawa
- 07Yoro Valley
- 08Kisarazu
Photo: ブルーノ・プラス · CC BY 4.0Haneda Gateway
An airport-side pickup reaches Tokyo Bay without taking a car through the capital’s core.
Haneda Airport (羽田空港, Haneda Kūkō; IATA: HND, ICAO: RJTT), officially Tokyo International Airport (東京国際空港, Tōkyō kokusai Kūkō) and sometimes abbreviated to Tokyo-Haneda, is a Japanese international airport, the busier of the two serving the Greater Tokyo Area, the other being Narita International Airport (NRT). It serves as the primary domestic base of Japan's two largest airlines, Japan Airlines (Terminal 1) and All Nippon Airways (Terminal 2), as well as RegionalPlus Wings Corp.
Photo: Filler Broad-Sky in Japan Font "GD-HighwayGothicJA" - pumpCurry in Japan · CC BY-SA 2.1 jpUmihotaru
A highway island marks the change from tunnel to bridge in the middle of Tokyo Bay.
The Tokyo Bay Aqua-Line (東京湾アクアライン, Tōkyō-wan Akua-rain), also known as the Trans-Tokyo Bay Expressway, is an expressway that is mainly made up of a bridge–tunnel combination across Tokyo Bay in Japan. It connects the city of Kawasaki in Kanagawa Prefecture with the city of Kisarazu in Chiba Prefecture, and forms part of National Route 409.
Photo: Mauricio V. Genta · CC BY-SA 4.0Mount Nokogiri
A former quarry ridge rises above the bay with temple paths and cliff viewpoints.
Mount Nokogiri (鋸山, Nokogiri-yama) literally "saw mountain" is a low mountain on the Bōsō Peninsula on Honshu, Japan. It lies on the southern border of the city of Futtsu and the town Kyonan in Awa District in Chiba Prefecture. The mountain runs east to west, having the characteristic sawtoothed profile of a Japanese saw (鋸, nokogiri).
Photo: User:Xser21 User:Saigen Jiro FoxyStranger Kawasaki · CC BY-SA 4.0Tateyama
A bay town, castle hill and nearby beaches make the natural southern base.
Tateyama (館山市, Tateyama-shi) is a city located in Chiba Prefecture, Japan. As of 1 November 2020, the city had an estimated population of 44,865 in 20,558 households and a population density of 410 persons per km2. The total area of the city is 110.05 square kilometres (42.49 sq mi).
Photo: ガウス at Japanese Wikipedia · CC BY-SA 3.0Nojimazaki Lighthouse
Japan’s southern Boso headland looks across the open Pacific and Tokyo Bay approaches.
Nojimazaki Lighthouse stands at the southern tip of the Bōsō Peninsula, where Tokyo Bay opens into the Pacific. The white tower, rocky shoreline and short headland paths make this both a navigation landmark and the clearest geographic turning point on the coastal loop.
Photo: Shift User:Volfgang User:おぉたむすねィく探検隊 Toshihiro Matsui User:じーさん User:Tak1701d User:あばさー · CC BY-SA 4.0Kamogawa
Fishing coast and Pacific beaches turn the circuit north along Boso’s eastern side.
Kamogawa (鴨川市, Kamogawa-shi) is a city located in Chiba Prefecture, Japan. As of 1 December 2020, the city had an estimated population of 31,722 in 14,558 households and a population density of 170 persons per km2. The total area of the city is 191.14 square kilometers (73.80 sq mi).
Photo: coniferconifer · CC BY-SA 3.0Yoro Valley
A wooded river gorge adds short walks and an inland contrast before the bay return.
Yoro Valley follows a wooded gorge cut by the Yoro River in central Chiba. Short trails, small waterfalls, railway scenery and autumn colour make it one of the Boso Peninsula’s clearest inland contrasts to the coast.
Photo: User:Kentagon 運転太郎 Hiroaki Kaneko hokkane4 · CC BY-SA 4.0Kisarazu
The Aqua-Line gateway is the last place to refuel and verify the bay crossing.
Kisarazu (木更津市, Kisarazu-shi) is a city located in Chiba Prefecture, Japan. As of 1 December 2020, the city had an estimated population of 136,023 in 63,431 households and a population density of 980 persons per km2. The total area of the city is 138.95 square kilometres (53.65 sq mi).
Drive the conditions,
not the itinerary.
Collect near Haneda, reserve ETC and check Aqua-Line wind restrictions both ways. Use coastal parking, never stop on a bridge or sea wall and leave a full return buffer before any flight.
Checked against
the people who run it
Distances and driving times are planning estimates. Conditions, closures, ferries, permits and park rules can change, so check the linked official guidance before setting out.