Northeast Passage the Novaya Zhelaniya straits (at the Novaya Zemlya archipelago, connecting the Barents Sea to the West and the Kara Sea to the East), to Cape Dezhnev by the Bering Strait. Therefore, the NEP encompasses all the East Arctic seas, and the NSR all the seas except the Barents Sea. Since the NSR constitutes the majority of the NEP, sometimes the term NSR has been used to refer to the entirety of the NEP. The governance of the NEP has developed considerably in the late 20th and early 21st centuries. The main sources of governance are the United Nations Convention on
Severnaya Zemlya to a survey of prior observations by De Korte, Volkov, and Gavrilo, thirty-two bird species have been observed on Severnaya Zemlya, 17 of which are known to breed on the islands. Eight species are widespread across the archipelago: five of which are colonial seabirds: little auk ("Alle alle"), black-legged kittiwake ("Rissa tridactyla"), black guillemot ("Cepphus grylle"), ivory gull ("Pagophila eburnea"), and glaucous gull ("Larus hyperboreus"); and three species of tundra bird: the snow bunting ("Plectrophenax nivalis"), purple sandpiper ("Calidris maritima"), and brent goose ("Branta bernicla"). The most common mammal on Severnaya Zemlya is the collared lemming ("Dicrostonyx torquatus"), also known