The Omono River (雄物川, Omono-gawa) is located in Akita Prefecture, Japan. The river flows from Mount Daisen on the border of Akita Prefecture with Miyagi and Yamagata Prefectures in the city of Yuzawa and drains into the Sea of Japan at the city of Akita. The river's drainage basin is essentially the entire southern half of Akita Prefecture. The river is free of dams for its entire length. It is regarded as a "first class river" in the Japanese river classification system.^[1]

Omono River
Omonogawa Bridge
Native name	雄物川 (Japanese)
Location
Country	Japan
Physical characteristics
Source
• location	Mount Daisen
• elevation	920 m (3,020 ft)
Mouth
• location	Sea of Japan
• elevation	0 m (0 ft)
Length	133 km (83 mi)
Basin size	4,710 km2 (1,820 sq mi)
Discharge
• average	276.2 m3/s (9,750 cu ft/s)
Basin features
River system	Omono River