| Bolshoye Toko | |
| Location: | Sakha |
| Pushpin Map: | Russia#Russia Sakha Republic |
| Inflow: | Utuk |
| Outflow: | Mulam |
| Basin Countries: | Russia |
| Area: | 82.6km2 |
| Depth: | 42m (138feet) |
| Max-Depth: | 80m (260feet) |
| Elevation: | 903m (2,963feet) |
The Bolshoye Toko is a lake in Sakha, Russia. It has a surface of 82.6frac=16NaNfrac=16 and a catchment area of 919km2. Its outflow is the Mulam river, part the Uchur River basin. The lake is located in the Aldan Highlands, on the border of Sakha Republic and Khabarovsk Krai. River Utuk flows into the lake from the Toko-Stanovik subrange of the Stanovoy Highlands. It is the deepest lake in Yakutia.[1]