The round 2-pin plug in Europe usually refers to the Europlug (Type C), which has two round pins and is ungrounded. It’s widely used across Europe for low-power devices (up to 2.5 A).
Western Europe: Austria, Belgium, France, Germany, Netherlands, Portugal, Spain, Luxembourg, Switzerland (also uses Type J), Liechtenstein
Northern Europe: Denmark, Finland, Norway, Sweden, Iceland
Eastern Europe: Bulgaria, Croatia, Czech Republic, Hungary, Poland, Romania, Slovakia, Slovenia
Southern Europe / Mediterranean: Greece, Turkey, Cyprus, Albania, Bosnia & Herzegovina, Serbia, Montenegro, North Macedonia
Baltic States: Estonia, Latvia, Lithuania