Primorsky District, Arkhangelsk Oblast and with Onezhsky District in the south. From the north, the district is washed by the White Sea. The area of the district is . Its administrative center is the city of Arkhangelsk (which is not administratively a part of the district). Population: The district occupies the lower course of the Northern Dvina River and the White Sea coast around the Dvina Bay. The waters of the district drain into the Northern Dvina and the short rivers of the Dvina Bay basin, such as the Shirshema and the Lodma. The eastern part of the district is a plateau which drains
Onega stepanovi by an undivided zone. The surface of the undivided region of "Onega" is covered with small tubercles. "Onega" was originally described by Mikhail Fedonkin as a problematic organism, being grouped together with "Vendia", "Praecambridium" and "Vendomia" as possible stem-group arthropods due to a vague similarity with primitive Cambrian trilobites and arthropods. In 1985 Mikhail Fedonkin erected Phylum Proarticulata, in which he placed: "Onega", "Dickinsonia", "Palaeoplatoda", "Vendia", "Vendomia", "Praecambridium" and "Pseudovendia sp.", although he did not exclude the possibility that "Onega" may still be related to various lower Cambrian arthropods, such as "Skania". Andrey Yu. Ivantsov has proposed that "Onega" be