Hi everyone,
I'm wondering why the sentence below includes "собой":
"Многочисленные действующие вулканы ... гейзеры, горячие источники, лавовые поля и ледники покрывают собой почти всю территорию страны."(Source: Wikipedia)
I get that active volcanoes, geysers etc. cover almost the territory/area of the country as a whole.
Reading about geographical facts of some countries, however, I can remember to have come across sentences like "Леса покрывают ... ".
What's the deal with собой and this particular verb? What difference would it make if I didn't use it in this case?