Poronaysk (Russian: Поронайск; Japanese: 敷香町, romanized: Shisuka-chō; Ainu: Sistukari or Sisi Tukari[7]) is a town and the administrative center of Poronaysky District of Sakhalin Oblast, Russia, located on the Poronay River 288 kilometers (179 mi) north of Yuzhno-Sakhalinsk.

[citation needed] The Treaty of Portsmouth transferred it to Japanese control along with the rest of the southern half of the island of Sakhalin.

It was renamed Shisuka (敷香町, Shisuka-chō), said to mean "Sisi Tukari (in front of the mountain)" or "Siika (big river)" in the Ainu language, remaining under Japanese control until the Soviet Army retook the whole of the island in 1945.

Sakhalinskaya GRES power station is supplied with coal from an open cut mine close to the town.

The town lies on the island's railway network, as well as on the main highway connecting Yuzhno-Sakhalinsk with Alexandrovsk-Sakhalinsky.