Vankina Guba (Bay)
Vankina Guba (Bay) – situated in the eastern part of the Laptev Sea to the south of Ebelyakh Bay which is separated from it by the Shirokostan Peninsula. It is shallow (up to 17 m), 6–18 km wide. The Khaarstan and the Chokurdakh rivers and many small creeks flow into it. The area of the bay is about 350 km2. The water area is fringed with vast foreshores and beaches up to 5 km wide. In the north the bay is separated from the sea by a submerged shoal, by the continuation of the foreshore spit of Cape Nerpichiy, in the west, and by a submerged bar about 7 km long. Certain areas of the shore demonstrate abrasion processes, in the northern part their total length comprises about 19 km and in the south 11 km.
The scientists single out four beach barriers made of pebbles and breakstone. They mark the lines of maximum upsurges. Three of them are 1.5–2 m higher than the average sea level, and the farthest barrier is 7–8 m higher than it. It marks the extreme upsurge when to the east of the ordinary shoreline there appears a vast “upsurge bay,” penetrating into the coastal tundra up to the foot of the original island upland called Khaarstan. This upland along with the bald peak Chokurdakh, lying on the shore of the V.G., are the main source of breakstone and rotted rock which after getting to the coastal zone turn into pebbles and gravel of the beaches under the influence of waves and tides. Both the uplands together with several more form the meridional zone of upheaval which stretches northward as far as Cape Svyatoy Nos and further to the Lyakhovsky Islands. They are formed by chalk deposits with impregnations of granite and are marked by metalizing process which has a big industrial importance.