The omega-shaped lands surrounded by such flections usually form cut-off hills, however, some places like are re-formed by people to built short paths of water for the prevention of flood.
こうした屈曲にΩ字状に囲まれた土地は環流丘陵を構成するが、水害防止の観点から水路を短絡させる工事が行われている箇所もある。