Lands of lost borders: a journey on the Silk Road

Marco made me do it: North America

Roof of the world: Tibetan Plateau

Natural history: England and New England

Undercurrents: Black Sea

The cold world awakens: Lesser Caucasus

Angle of incidence: Greater Caucasus

Borderlandia: Caspian Sea

Wilderness/wasteland: Ustyurt Plateau and Aral Sea Basin

The source of a river: Pamir Knot

A mote of dust suspended in a sunbeam: Tarim Basin and Tibetan Plateau

Road's end: Indo-Gangetic Plain and Greater Himalaya.