Translation of "Harshest" in Dutch

I'm Bear Grylls, and I've survived in some of the harshest places on the planet.

Ik ben Bear Grylls en ik heb de meest onherbergzame plekken op aarde overleefd.

[shouting over airplane] Let's go and find this wreckage. [Bear] We're flying west over some of the harshest terrain in the world.

Laten we dat wrak vinden. We vliegen richting het westen over zeer ruig terrein.