UN Ship Nomenclature

Here's some thoughts about ship names for the UNSC:
(With apologies to Ms. Cherryh)

SDN: Continents (Africa, Asia, Europe, Australia, Antarctica, North &
South 
America)
CVA: Oceans (Pacific, Atlantic, Arctic, Indian)
CVL: Seas (Weddell, Caspian, Black, etc)
BDN: Major Rivers (Amazon, Mississippi, Danube, Volga, Congo)
BB: Mountain Ranges (Ural, Rocky, Grampian, Great Dividing)
BC: Mountains (Everest, Ranier, Matterhorn)
CA: Lakes
CE: Bays
CL:
DD:
FF:
CR:
SS: Islands

Well, I still need a name-type for the Light Cruiser, Destroyer, Frigate
& 
Corvette.  I'm trying to stick with natural features, to avoid getting
the 
UN into political mudfights (Hey, you named a carrier after them and
only 
an Escort Cruiser after us?).  ANy ideas?

BTW, who's the reigning NAC monarch in 2185?

Noah