The map below shows the location of the FALKENBURCH land next to the North Fork of the Shenandoah River in Virginia.  The land was a 300 acre plot bordering on the river and the Wagon Road crossed the land on the western end of the plot.  The source of this information is Lord Fairfax Land Suit transcript p 65..

The Fairfax Land Suit transcript p. (65) also has this on the Falkenburghs:

"Know all men by these presents that I, Jacob Falkenburgh of Augusta County in the Colony of Va have Bargained
and sold and by these presents do sell over to George Seller of Frederick Co, and Colony aforesaid, .all my right and Title of
a certain Plantation or improvement lying and being on Sherrando River between Henry Falkenburgh and Andrew Falkenburgh
to have and to hold......etc ....

Witness my hand and seal this twenty third day of March 1744/45
Jacob (JF) Falkenburgh (SS)
his mark

This anchors the three Falkenburgh properties, all in a row, with the middle one sold to George Seller. We show the middle one in our map. The others had been sold.

Those are the three Falkenburghs who were later in NC/SC. The site is directly across the old wagon road about midway between Woodstock and Edenburg, near Willow Grove at a point near the river's edge at one of the seven bends.