Conventionally the Bosphorus is the dividing line between Europe and Asia, so Istanbul is in Europe and Ankara is in Asia. 

On Tue, Apr 28, 2009 at 1:02 AM, Petr Baudis <pasky@suse.cz> wrote:
On Mon, Apr 27, 2009 at 01:48:06PM -0700, Paul Schauble wrote:
> I guess the question is whether the grouping for tz purposes is
> geographic or political.
>
> When Turkey joins the EU, will it move to the Europe tz file?

I had the very same idea, but it turns out that Europe/Istanbul is
already in the Europe tz file anyway. ;-)

                               Petr "Pasky" Baudis