Dividing two biogeographic regions, the Duero River flows through a vast diversity of landscapes forming a borderline between northern Europe and the Mediterranean region.
But besides being a point of transition between different landscapes, the Duero also hosts a surprisingly high level of biodiversity: recent scientific discoveries indicate that two out of three species of fish that inhabit the Duero are endemic, and are not found anywhere else out of Iberian rivers.
Three years of observation and underwater exploration in the Duero Basin to discover what makes this place one of the most unique evolutionary laboratories in the world.
An unprecedented endeavour to create a stunning documentary on one of the most surprising biological groups of fauna in the world.
The DURIENSES: the endemic species of the Duero.