The northern crested newt is the most widespread species, while the others are confined to smaller regions, e.g. the southwestern Iberian Peninsula in the southern marbled newt,[REF] and the Danube basin and some of its tributaries in the Danube crested newt [REF].
Triturus species usually live at low elevation; the Danube crested newt for example is confined to lowlands up to above sea level [REF].