[ta1243]

London is 3 times the size of Manhattan, Bronx, Queens and Brooklyn combined, and Zone 6 is even larger than that.

I assume an "unlimited metro card" also includes unlimited buses too?

[evanelias]

Yes, it includes local buses. It also includes the Staten Island Railway, so it doesn't make sense to exclude an entire NYC borough from land size comparisons.

[switch007]

I wasn't sure and hedged on a 4 zone.

A 2 zone is $220. I think in size that's roughly comparable?

And in my experience people who mostly take the tube rarely make use of buses. They'll walk or take the tube