The Shiretoko Peninsula (知床半島, Shiretoko-hantō) is located on the easternmost portion of the Japanese island of Hokkaidō, protruding into the Sea of Okhotsk.

[1] The cold Oyashio Current flows southwest along the east side of the peninsula, and the Soya Current flows southeast from the Sea of Okhotsk until it is redirected north along the west side of the peninsula.

On April 23, 2022, a 19-ton tourist boat with 26 people on board sank during a tour around the Shiretoko peninsula.

[5] The boat was found 100 meters below sea level near the scenic site Kashuni Falls.

[5] The Shiretoko Peninsula is home to many species of both conifers and broadleaf trees, including the acorn-bearing Quercus mongolica (mizunara).

The last confirmed record of Japanese otter in Hokkaido was from Shari River[6] Whale watching is a popular attraction for tourists.

Especially for orcas, or killer whales, the waters surrounding the peninsula are regarded as one of the most significant habitat areas in the northwestern Pacific.

Baird's beaked whales, the largest of this group, are most frequently observed close to shore.

An unidentified form or subspecies of beaked whale is known to inhabit the waters off Shiretoko Peninsula and Abashiri.

There is notable flora diversity including endemic Cymathaere japonica, endangered species such as Viola kitamiana (Japanese) which Japanese name was named after Shiretoko Peninsula, Dendranthema arcticum, Astragalus japonicus.