That's always been a weird one for me. If I might quote Gemini's summary since it seems accurate enough:

> Geographical/Historical: The Bosporus Strait in Turkey is historically considered the dividing line between Europe (West) and Asia (East).

> Prime Meridian: The 0° longitude line running through Greenwich, England, is used to technically separate the Eastern and Western Hemispheres.

> Cultural/Political: Cultural definitions are often more relevant, placing countries like Australia, New Zealand, and North America in the "West" due to historical ties, despite their geographic location.

I suppose you're leaning into the "Bosporus Strait" option more than the "Prime Meridian" option, given that the former would put most of Europe in the West while the latter would put most of it in the East.