The peninsula is most often visited as the gateway to the island of Kinkasan, which can be accessed by ferries running from the coastal whaling port of Ayukawa in Ishinomaki, Miyagi and from Onagawa.

[4] One of the hamlets affected by the tsunami was Yoriisohama (寄磯浜) located about 1 km east of the Onagawa Nuclear Power Plant, on a headland comprising cliffs and small fjord-like bays on the eastern side of the Oshika Peninsula.

The main settlement is in a south-facing bay on the southern slope of Azumamori Mountain (東森山, Azumamoriyama), (153m high).

[6] As of 2005 Yoriisohama consisted of about 100 households, with a population of about 500, mainly engaged in fishery and related occupations.

Historically, Yoriiso included the hamlet of Maeami (前網) 500 metres to the west (population 100 / 25 households).