The landscape of Pallas-Yllästunturi National Park is dominated by a chain of fells, which is the remains of an ancient folded mountain range. Today's rounded fells are the worn-down bases of those mountains. The highest point in the national park is Taivaskero in the Pallastunturi Fells, which is 809 metres above sea level. Other high summits include Pyhäkero, Lumikero, Laukukero and Palkaskero. Kero is a Finnish word that refers to the round, treeless top of a fell.