Peter F. answered 05/13/20
Worldly K-12th Grade Geography Teacher; 18 Years' Teaching Experience
Wikipedia is partly correct in its geographic description. As is the case with many national, subcontinental (in the case of the Indian subcontinent), regional, U.S. state, city, and even island borderlines: bodies of water, mountains, deltas, and plateaus can each serve as official borders between geographic locations of all types worldwide.
When zooming in on the borderline(s) between the European and Asian continents: in addition to the different geographic locations mentioned by Wikipedia, the nations of Turkey and Russia (formerly the U.S.S.R./Soviet Union) serve as the intercontinental borderlines between Europe and Asia.
I hope this helps to provide some further insight into your inquiry!