The image contains a map of ancient Russia. What geographical features are labeled on the map?

Geographical Features:

• Seas: Barents Sea, Kara Sea, Laptev Sea, East Siberian Sea, Chukchi Sea, Bering Sea, Sea of Okhotsk, Japanese Sea, Arctic Ocean, Northern Ocean, Pacific Ocean.
• Rivers and Lakes: The map shows numerous rivers and lakes, but specific names are not consistently legible across the entire map.
• Landmasses: The map depicts various regions of Russia, including plains and plateaus, with labels such as 'West Siberian Plain', 'Middle Siberian Plateau', and 'Kamchatka'.
• Oceans: Northern Ice Ocean (Северный Ледовитый Океан).
• Other Features: Glacial formations (Ледовитый) and potential ice cover are indicated in the northern regions.