Already made a flag about it here ( https://www.inaturalist.org/flags/778922 ), but Kazakhstan’s areas west of the Ural River (Oral and some parts of Atyrau provinces) are technically within European boundaries, and not within Asia as the rest of the country is. However, the iNat place for Europe chooses to exclude Kazakhstan entirely (https://www.inaturalist.org/places/europe-84d7a1a6-93a4-4b07-a566-1d4215b0dfe2), which I believe to be very inaccurate.
Sources:
National Geographic Atlas of the World (9th ed.). Washington, DC: National Geographic. 2011. ISBN 978-1-4262-0633-7. “Europe” (plate 59); “Asia” (plate 74): “A commonly accepted division between Asia and Europe … is formed by the Ural Mountains, Ural River, Caspian Sea, Caucasus Mountains, and the Black Sea with its outlets, the Bosporus and Dardanelles.”
CIA World Factbook: https://www.cia.gov/the-world-factbook/countries/azerbaijan/
Klement Tockner; Urs Uehlinger; Christopher T. Robinson (2009). “18”. Rivers of Europe (Illustrated ed.). Academic Press. ISBN 9780123694492.