Izhora Plateau
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The Izhora Plateau (russian: Ижорская возвышенность) is an elevated landform on
Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start ...
limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms whe ...
bedrock in the southwestern part of
Leningrad Oblast Leningrad Oblast ( rus, Ленинградская область, Leningradskaya oblast’, lʲɪnʲɪnˈgratskəjə ˈobləsʲtʲ, , ) is a federal subjects of Russia, federal subject of Russia (an oblast). It was established on 1 August 1927, a ...
, between the
Gulf of Finland The Gulf of Finland ( fi, Suomenlahti; et, Soome laht; rus, Фи́нский зали́в, r=Finskiy zaliv, p=ˈfʲinskʲɪj zɐˈlʲif; sv, Finska viken) is the easternmost arm of the Baltic Sea. It extends between Finland to the north and E ...
in the north and the
Luga River The Luga () is a river in Novgorodsky and Batetsky Districts of Novgorod Oblast and Luzhsky, Volosovsky, Slantsevsky, and Kingiseppsky Districts of Leningrad Oblast of Russia. The river flows into the Luga Bay of the Gulf of Finland. It freeze ...
in the south. Its northern edge is formed by the erosional cliff known as the Baltic-Ladoga Klint. The highest part of the plateau is the Orekhovaya hill of
Duderhof Heights Duderhof Heights or Duderhof Hills (russian: Дудергофские высоты; german: Duderhofer Höhen) is a small highland area in the southwestern part of Saint Petersburg (Krasnoselsky District). The nearest railway station, Mozhayskaya ...
at 176 m, situated in its extreme northeastern part. The plateau is mostly covered by agricultural lands. It used to be the heartland of the historical region known as
Ingria Ingria is a historical region in what is now northwestern European Russia. It lies along the southeastern shore of the Gulf of Finland, bordered by Lake Ladoga on the Karelian Isthmus in the north and by the River Narva on the border with Est ...
. Landforms of Leningrad Oblast Ingria Plateaus of Russia {{LeningradOblast-geo-stub