The Bōsō Hill Range provided a natural fortification against air attack of Tokyo during World War II, when the 252 Air Group of the Imperial Japanese Navy (IJN) built the Mobara Air Field in 1941 in Mobara.
The Bōsō Peninsula is defined by the Pacific Ocean to its east and south, Tokyo Bay to the west, and the Edo and Tone rivers to the north.
Tokyo is some 300 km from the Boso triple junction, and is subject to quakes and tsunamis generated from slips along this junction.
In 589, when the Frankish king Guntram sent an army under the general Boso into Septimania in support of a rebellion by the Arian archbishop Athaloc, Claudius was sent by King Reccared to defeat it.
The first margrave (marchio), later duke (dux), of Burgundy was Richard of the House of Ardennes, whose duchy was created from the merging of several regional counties of the kingdom of Provence which had belonged to his brother Boso.
The Tondo Province annexed to this new district the towns of Cainta, Taytay, Antipolo and Boso-boso, while Laguna contributed the towns of Angono, Binangonan, Cardona, Morong, Baras, Tanay, Pililla and Jalajala.
The establishment of the march was followed by the Merseburg diocese under Bishop Boso in 968.
Plans for a railroad bisecting the Bōsō Peninsula were drafted by the Railway Ministry in the Meiji period, with the aim of connecting the town of Kominato (now part of Kamogawa City), a town facing the Pacific and famous as the birthplace of Nichiren, for economic and military reasons.
The southern neighbours of Duga are Peki Dzake and as well as the Asuogyaman District villages of Anum and Boso.
The Kihara Line from Ōhara Station on the Sotobō Line was extended to Kazusa-Nakano Station, and it was planned that Kururi Line and Kihara Line would be connected to form a single route across the Bōsō Peninsula (which would have been named the Kihara Line).
Emperor Charles the Fat, son of Louis the German, by 884 had once again reunited all Carolingian territories, except for the Lower Burgundian Kingdom of Provence established by Boso in 879.