The is a railway line in Chiba Prefecture, Japan, owned and operated by East Japan Railway Company (JR East). It connects à Âami Station in the city of à Âamishirasato and Narutà  Station in the city of Sanmu.
Some trains run from to (In Japanese is æÂÂæÂ±(Kanji),ãªãÂÂã¨ãÂÂ(Hiragana)), and some run through to/from Chiba Station via the Sotobà  Line. Every morning, a Local train runs from Narutà  to Tokyo Station via the Sotobà  and Keiyà  lines. Every evening, a Local train runs from Tokyo to Narutà  via the same route as the one in the morning. As of 16 March 2024, all Commuter Rapid and Rapid services operating through to/from the Keiyà  Line were replaced by Local trains.
The Boso Railway Co. opened the Oami - Togane section in 1900, and was nationalised in 1907.
JGR opened the Togane - Naruto section in 1911.
The line was electrified (at 1,500 V DC overhead) from 1 October 1973, CTC signalling was commissioned the following year, and freight services ceased in 1999.