Biwako Sokui (琵琶湖疏水) or Lake Biwa Canal (since 疏 is not included in the national list of Chinese characters in common use, 疎 is also used as in 琵琶湖疎水) is a waterway that was built to transport water from Lake Biwa to Kyoto City.
琵琶湖疏水（びわこそすい、「疏」が常用漢字外であり「疎」に書き換えられるため琵琶湖疎水とも表記される）とは、琵琶湖の湖水を、京都市へ運ぶために作られた水路（疏水）である。