Volga: Mother of Rivers (2019) IMDb
Seen in 2020.
I saw a version with Swedish-language narration and German-langague maps on SVT: 2 × 52 episodes.
The first episode squeezes in some nice old Orthodox convents and a charming Russian desman. The second episode has a floppy-nosed saiga antelope running in slow motion and finds a symbolically rich wreck of a small fishing boat in the estuary, where eagles have nested atop the bridge roof and smaller birds occupy other parts of the boat in order of size and rank.
References here: Faktafel på SVT Play.