The flathead sole, Hippoglossoides elassodon, is a flatfish of the family Pleuronectidae. It is a demersal fish that lives on soft, silty or muddy bottoms at depths of up to 1,050 metres (3,440 ft). Its native habitat is the northern Pacific, from the seas of Japan and Okhotsk, across the Bering Sea and to the coast of North America, as far south as Point Reyes, USA. It grows to 52 centimetres (20 in) in length, and can weigh up to 1.56 kilograms (3.4 lb); females are typically larger than males. Lifespan is at least 27 years for females and at least 30 years for males.