Disseminated copper sulfides are common in veins in Western Macedonia. Alpine cycle sedimentary rocks are situated between the European hinterland in the Serbo-Macedonian Massif, which numbers 28 two-thousand meter peaks within the confines of the country. Landslides are a common occurrence and have caused deaths and economic grief.[2] The country "is characterized by high seismic activity and a relatively frequent occurrence of strong and catastrophic earthquakes."