* The fillcontinents method doesn't always do the right thing. Matplotlib
always tries to fill the inside of a polygon. Under certain situations,
what is the inside of a coastline polygon can be ambiguous, and the
outside may be filled instead of the inside.
Workarounds - change the map projection region slightly or
mask the land areas with the drawlsmask method instead of
filling the coastline polygons (this is illustrated in the ortho_demo.py example).