[2] Likskär is relatively new, as are the other islands in the region, having formed from post-glacial rebound after the last ice age and emerged from the sea after around 500 AD.

[3] There are traces of old fishing villages, including simple dwellings and mounds for drying nets, and several mazes made of boulders on Likskär and Renskär.

[3] During the bird breeding season of May June and July boats must not come closer than 200 metres (660 ft) to the islands of Ligogrunnan, Splitterören, Olnisbrottet, Mellangrundsbotten and nearby islets.

Away from the shore there are meadows with plants such as eyebright and valerian, then shrubs like buckthorn, willow and bog myrtle, and then a border of alder surrounding spruce forests.

Elk are often found on Renskär-Getskär, and resident mammals include fox, squirrel, ermine and plentiful hares.

Herring gulls, terns, guillemots and ruddy turnstones nest on Likskärsrevet and Ligogrunnan, and there are spotted redshanks on the smaller islands.