[3] Checleset Bay was named in the late 1930s in association with the Kyuquot/Cheklesahht First Nation of nearby Kyuquot Sound.

Today the Klaskino are part of the Quatsino First Nation, whose territory lies just north of Checleset Bay and Brooks Peninsula.

It was used by Gray's officer Robert Haswell and several times by John Boit in his log of the Union, which anchored in the cove in 1795.

[5] Just east of Acous Peninsula, at the entrance of Ououkinsh Inlet is Battle Bay.

[12] Near the head of Ououkinsh Inlet is the mouth of the Power River,[13] which flows through the Hisnit River Watershed Protected Area[14] and Power Lake[15] before emptying into Ououkinsh Inlet near the former Cheklesahht village of Hisnit.

[24] Most of Checleset Bay is protected as the 34,650-hectare (85,600-acre) Checleset Bay Ecological Reserve, which was established in 1981 for the reintroduction of sea otters, which were once abundant but hunted to local extinction in British Columbia during the maritime fur trade era.

By 2013 their range had expanded over much of the coasts of western and northern Vancouver Island and elsewhere, with a total population of about 5,600.

In addition they are protected by the Marine Mammal Regulations in the federal Fisheries Act.

[27] For these reasons motorized watercraft are not allowed in Checleset Bay and there are restrictions or bans on activities like fishing and camping.