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Lopérec borders the Monts d'Arrée to the north and east, and the Châteaulin basin to the south. The municipal boundary, stretching north-south and sloping toward the west, covers an area of 3,959 hectares (39.5 km2). It is characterised by a hilly landscape, with altitudes ranging from 316 metres to 11 metres above sea level, with the village situated at around 52 metres.
Lopérec is approximately 9 kilometres (5.6 mi) northeast of Châteaulin. Numerous rivers are found in the area, including the Douffine which originates from the south-western slopes of Roc'h Cléguer en Brasparts and forms the municipal boundary to Pleyben. Also present is the Rivoal (or Saint-Rivoal River), which comes from Saint-Rivoal and forms the boundary towards the east with the municipality of the same name. Before it passes under the Quimper to Landerneaurailway viaduct, it is joined on the right by the Lenturec stream, which traverses the entire commune and passes just south of Lopérec town. Downstream, another small right-bank tributary of the Douffine forms the edge of Pont-de-Buis-lès-Quimerc'h municipality.
