According to an eNotes study guide, "The Interlopers" is a short story by Saki, set in the Carpathian Mountains of Eastern Europe. The story resembles a fable and concerns the conflict between two families.
According to the Encyclopedia Britannica, the Carpathian Mountains constitute the easterly extension of the Alps. The Encyclopedia also states that this mountain range is conventionally held to begin at a point in Slovakia, extending for 900 miles to Romania. The source clarifies, however, that the accurate limits in a geological sense are different, extending as far west as Austria and as far south as Serbia and Montenegro.