Ecoregions
| ID | Realm | Major Habitat Type | Ecoregion |
|---|---|---|---|
| 601 | Palearctic | Xeric freshwaters and endorheic (closed) basins | Irgyz -Turgai |
| 602 | Palearctic | Polar freshwaters | Ob |
| 603 | Palearctic | Temperate upland rivers | Upper Irtysh |
| 604 | Palearctic | Montane freshwaters | Chuya |
| 605 | Palearctic | Polar freshwaters | Yenisei |
| 606 | Palearctic | Large lakes | Lake Baikal |
| 607 | Palearctic | Polar freshwaters | Taimyr |
| 608 | Palearctic | Polar freshwaters | Lena |
| 609 | Palearctic | Polar freshwaters | Kolyma |
| 610 | Palearctic | Polar freshwaters | Anadyr |
| 611 | Palearctic | Polar freshwaters | East Chukotka |
| 612 | Palearctic | Temperate coastal rivers | Koryakia |
| 613 | Palearctic | Temperate coastal rivers | Kamchatka & Northern Kurils |
| 614 | Palearctic | Temperate coastal rivers | Okhotsk Coast |
| 615 | Palearctic | Temperate coastal rivers | Coastal Amur |