is a river in Hokkaidō

Hokkaido

, formerly known as Ezo, Yezo, Yeso, or Yesso, is Japan's second largest island; it is also the largest and northernmost of Japan's 47 prefectural-level subdivisions. The Tsugaru Strait separates Hokkaido from Honshu, although the two islands are connected by the underwater railway Seikan Tunnel...

, Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

.

Course

The Niikappu River flows south to southwest from Mount Poroshiri

Mount Poroshiri

or sometimes Mount Horoshiri is located in the Hidaka Mountains, Hokkaidō, Japan. It is the highest mountain in the Hidaka range, and is one of the 100 famous mountains in Japan.-Nukabira course:The course is a two-day course....

 in the Hidaka Mountains

Hidaka Mountains

Hidaka Mountains is a mountain range in southeastern Hokkaidō, Japan. It runs 150 km from Mount Sahoro or Karikachi Pass in central Hokkaidō south, running into the sea at Cape Erimo. It consists of folded mountains that range from 1500 to 2000 metres in height. Mount Poroshiri is the highest...

. The river flows through four dams, including Niikappu Dam and Okuniikappu Dam. Both dams are owned by the Hokkaido Electric Power Company, Inc

Hokkaido Electric Power Company

The , or for short, is the monopoly electric company of Hokkaidō, Japan. It is also known as Hokuden, Dōden, and HEPCO. The company is traded on the Tokyo Stock Exchange , Osaka Securities Exchange , and Sapporo Securities Exchange....

. The dams form Lake Niikappu and Lake Poroshiri, respectively. After 80 kilometres (49.7 mi), the river empties into the Pacific Ocean

Pacific Ocean

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

.