Can large relict reptiles and amphibians inhabit the Far North water bodies?

The article analyzes and systematizes reports of local residents, travelers, explorers of the Russian North (Yakutia, the Taymyr Peninsula), as well as legends and folk tales of huge, yet unknown to science, lizard-like creatures inhabiting these parts of the world. The data is examined from folklore, ecological, and paleoecological perspectives. One cannot assert that this information is completely unreliable. Given the insufficient knowledge of the Russian North and the low anthropogenic impact on the area, it would be wrong to totally exclude the possibility that animals little known to science dwell there. The study assesses the theoretical feasibility of the existence of unknown reptiles and amphibians, which are difficult to access and study by traditional zoological methods, in the North and a few other parts of the planet.