Hidaka Mountains (日高山脈, Hidaka-sanmyaku) is a mountain range in southeastern Hokkaido, 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 at 2052 m. The Hidaka Mountains separate the subprefectures of Hidaka and Tokachi. Most of the range lies in the Hidaka-sanmyaku Erimo Quasi-National Park (日高山脈襟裳国定公園, Hidaka-sanmyaku Erimo Kokutei-kōen).