The 1745 atlas published by the Russian Academy of Sciences has the boundary follow the Don beyond Kalach as far as Serafimovich before cutting north towards Arkhangelsk, while other 18th- to 19th-century mapmakers such as John Cary followed Strahlenberg's prescription.
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Kazakhstan is also a transcontinental country by this definition, its West Kazakhstan and Atyrau provinces extending on either side of the Ural River.
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Most definitions extend the boundaries of the continent to its standard boundaries: the Ural Mountains, the Ural River, the Caspian Sea, and the Caucasus Mountains.
The Ural Mountains, Ural River, and the Caucasus Mountains are the geographical land border of the eastern edge of Europe.