Balkans
The term is criticized for having a geopolitical rather a geographical meaning and definition, as a multiethnic and political area in the Southeastern part of Europe. The geographical term of a peninsula defines that the water border must be longer than land, with the land side being the shortest in the triangle, but that's not the case with the Balkan Peninsula. Both Eastern and Western water cathetus from Odessa to Cape Matapan (ca. 1230-1350 km) and from Trieste to Cape Matapan (ca. 1270-1285 km) are shorter than land cathetus from Trieste to Odessa (ca. 1330-1365 km). The land has a too wide line connected to the continent to be technically proclaimed as a peninsula - Szczecin (920 km) and Rostock (950 km) at the Baltic Sea are closer to Trieste than Odessa yet it is not considered as another European peninsula. Since the late 19th and early 20th-century literature is not known where is exactly the Northern border between the peninsula and the continent, with an issue, whether the rivers are suitable for its definition. In the studies the Balkans natural borders, especially Northern border, are often avoided to be addressed, considered as a "fastidious problem" by André Blanc in "Geography of the Balkans" (1965), while John Lampe and Marvin Jackman in "Balkan Economic History" (1971) noted that "modern geographers seem agreed in rejecting the old idea of a Balkan Peninsula". Another issue is the name because the Balkan Mountains which are mostly located in Northern Bulgaria are not dominating the region by length and area like the Dinaric Alps. An eventual Balkan peninsula can be considered a territory South of the Balkan Mountains, with a possible name "Greek-Albanian Peninsula", but Greece is rarely defined as a Balkan nation both geographically and in international relations. The term influenced the meaning of Southeast Europe which again is not properly defined by geographical factors yet historical borders of the Balkans.
Central and Eastern Europe
According to the Organisation for Economic Co-operation and Development, "Central and Eastern European Countries (CEECs) is an OECD term for the group of countries comprising Albania, Bulgaria, Croatia, the Czech Republic, Hungary, Poland, Romania, the Slovak Republic, Slovenia, and the three Baltic States: Estonia, Latvia and Lithuania."