Though most of it is in Asia, Turkey spans two continents. The border of Europe and Asia is the Bosphorus, the historical core of Istambul is on the European side.

Meanwhile, in various fields, Turkey is bound to Europe stronger than to Asia: NATO membership, Council of Europe membership, aspiration to join the EU, UEFA membership [for the uninitiated: the European federation of football associations, which is something like MLB, NLF and NBA combined in importance], Eurovision membership.

_{*Lunatic*, n.
One whose delusions are out of fashion.}

BTW, on the map you link, there is the area explicitely marked "European Turkey".

_{*Lunatic*, n.
One whose delusions are out of fashion.}