the following followup report has been reconstituted from
concentrate
after the original which was launched yesterday has turned up
missing in the yahoo ether
so dont be surprised if more & better info arrives even much later
but the skinny for now is
http://www.lib.utexas.edu/maps/africa/mauritania_pol95.jpg
http://i-cas.com/mauritania/ksar_el_barka.htm
where it may be possible to see this megapoint while facing the
sunset from the hilltop beside the ghost town
tho demarcation if any is unknown
cardinal cross megapoints like azconmut or mbnuntsk are
normal & even common
as in the quadricounty points of the american midwest etc
but this quadri regional point of mauretania is the highest level if
not the only diagonal crisscross in the world
besides being one of fewer than a dozen known second level
megapoints of any description
etc