This is a long one.  It’s 4,688′ or so and centered at 37.152524, -81.693367, near Bandy VA.  Interesting design on this portal.  Since I’d just made a production of sliding on my belly down the 30′ or so embankment coming up here, I wasn’t in the mood to trudge over to the other portal to check it.  You can,  if you want to.