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バックナンバー85巻（平成20年）
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FEATURES ~ Japanese navigation channels out of port area developed and maintained by the government~
the unsung heroes to sustain the industries and lives of our country

In last December, some of them were expanded. They sustain our industries and lives by ensuring safe and stable navigation channels.
The feature of this month introduces their histories, their users' voices, and the recent efforts to have readers recognize the functions and significance of the navigation channels unknown to ordinary people.

What are the Japanese navigation channels out of port area developed and maintained by the government?　
/Tomoki Matsumura
The increasing significance of the navigation channels
・ The roles of navigation channel development to prevent marine accidents　/ Shin Ohnuki
・ The dredging project for Bisanseto channel affected by sand wave etc
/ Masanori Nishioka & Masatake Fukumoto
・ The expansion of three channels out of sixteen in last December/ Tomoki Matsumura
・ (Column) "Kaisho Maru", large dredging and oil collection vessel put in the development of Kanmon channel
/ Ministry of Land Infrastructure Transport and Tourism, Kyushu Regional Development Bureau,KanmonChannel Office
The navigation channels out of port area to sustain the industries and lives of Japan
・ Nakanose and Uragasuido channels in Tokyo Bay, supporting ocean transportation network
/ Yuji Tachibana
・ Taketomi Minami channel in Okinawa - the shortest course from Ishigaki Island to isolated islands
/ Cabinet Office, Government of Japan, Okinawa General Bureau, Ishigaki Port Office
・ The history and now of Kanmon Navigation Channel
/ Rieko Wakabayashi
Historic developed areas
・ The deletion project of an ex-fortress artificial island in Uragasuido channel in the beginning of the 21st century
/ Akira Tachi
・ The history of Hontoseto channel situated in Amakusa,Kumamoto
/ Ichiro Yoshinaga
Efforts by utilizing environmental sciences and advanced technologies
・ The improvement of ocean environment by use of dredged earth and sand at the Sea of Suoh ? "Sea Blue" project- 　
/ Tomonori Kubo
・ (Column) Efficient use of dredged earth and sand at Kanmon channel
/ Hiroaki Sumida
・ Analysis of actual navigations at seven areas, including Uragasuido channel by NILIM-AIS(National Institute for Land and Infrastructure Management- Automatic Identification System)
/ Hironao Takahashi
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