I made some progress. The Unknown Area Type is coming from the nhd_waterbody.shp file. There maybe others. Here is an snippet of the associated MP file:
[RGN80]
Type=Unknown Area Type
Data0=(42.793154,-74.090861),(42.7932061,-74.0908459),(42.79324,-74.0908361),
(42.7932875,-74.0907875),(42.793332,-74.090742),(42.7933389,-74.0907009),
(42.793304,-74.0906521),(42.79331,-74.090539),(42.7932929,-74.09051),
(42.793251,-74.090521),(42.79318,-74.0906109),(42.7931169,-74.0906419),
(42.7929449,-74.090676),(42.792906,-74.0907061),(42.792895,-74.0907239),
(42.7928969,-74.0908009),(42.7929141,-74.090877),(42.7929359,-74.0909039),
(42.792976,-74.0909109),(42.793049,-74.090888),(42.793154,-74.090861)
[END]
I tried to track it down to the .sql file but unfortunately the lat/long are not easily readable in the SQL file and the SHP file is binary.
What next?