Sklinna is a small archipelago which consists of several small islands with rocky shores, divided by shallow water. The main island in the archipelago is Heimøya. The archipelago as a whole is an important site for seabirds, especially in early summer. The most numerous bird species are the Atlantic puffin Fratercula arctica (1,350 pairs), European shag Phalacrocorax aristotelis (2,000 pairs, or 2% of the population found in this biogeographic region) and the great cormorant Phalacrocorax carbo (895 pairs; 1.5% of the regional population). Furthermore, it is a breeding area for nationally red-listed bird species such as the common guillemot Uria aalge and the kittiwake Rissa tridactyla  as well as for wintering seabirds. Gull and cormorant droppings provide nutrients for plants such as the common scurvy weed Cochlearia officinalis and the common sorrel Rumex acetosa. Sklinna has a long history of traditional fishing. The Site is also part of a long-term monitoring and mapping programme for Norwegian seabirds since its establishment as a SEAbird POPulations (SEAPOP) key site in 2007 and a SEATRACK site in 2014.