The Pyhäjärvi-Lakeaharju Hiking Trail offers lake landscapes in terrains of Lappajärvi, a crater lake created by the impact of a meteorite about 76 million years ago. The crater is surrounded by a bench rising to 100 m from the surface of the lake on the south-eastern shore of the lake, as a hogback consisting of the hills of Lakeaharju and Pyhävuori. When seen especially from the rocky top of Pyhävuori, the landscape of Lappajärvi is very steep by South Ostrobothnian terms.