Quickie survey [offlist]: DNS geolocation

I'd like to know of any networks (primarily providers) on here whose
customer-facing DNS recursion servers either (1) don't recurse directly to
the authoritative roots, instead deferring to the upstream's DNS; or (2) are
often not "nearby", geographically, to clients. For (2), transcontinental
or intercontinental indirect recursion configurations are of particular

I'm trying to gather some information for research regarding today's DNS
recursion, and how close (geographically) the last hop of recursion, before
the authoritative answer, is to the original requestor.