Nastola is wedged between the first and second
Salpausselkäs, the former being a prominent feature in the terrain and landscape of the southern part of the municipality. In the west, it splits in two distinct ridges around the village of
Villähde, and reaches it highest point in the parish village at above sea level. Moving further east towards
Iitti, the ridge becomes narrower and its ridgelines steepen in the surroundings of
Uusikylä. The area between the Salpausselkäs is characterized by its
eskers and
valleys. The esker of Vahteristonmäki, reaching past lake
Kymijärvi further north into
Heinola, peaks at above sea level in Nastola.
Till is the dominant type of soil in central and northern Nastola, with
clay deposits mostly being concentrated to the south of the first Salpausselkä, as well as around the lakes of Ruuhijärvi, Sylvöjärvi and Oksjärvi. The till areas are dotted with
bedrock protrusions, such as the high Ukonvuori hill in the east. The rocks on the south side of the Salpausselkäs tend to be lower and more rounded, and the majority of the bedrock consists of
granite. All of the lakes of Nastola, which are also all part of the Kymijärvi
drainage basin, are situated to the north of the first Salpausselkä; to its south are several smaller streams of water. == List of villages ==