The Keivsky area of about 10,000 km² is located in the central part of the Kola Peninsula between Efim Lake, the village of Kanevka, the northern foot of the Keiva Upland and the Ponoy River. Structurally, it corresponds to the Keiva synclinorium, stretching northwestward and joining the Voronyinsko‑Porosozersky in the northwest and the Imandra‑Varzugsky in the south ...