Mars, named after Bulgaria

3 named features. The International Astronomical Union records why each name was chosen, and those reasons are printed below exactly as they were approved.

FEATURES · 3

NAME	TYPE	SIZE	WHY THAT NAME
Arda Valles	valley	173.7 km	Ancient European river (Bulgaria).
Byala	crater	26.2 km	Town in Bulgaria.
Dulovo	crater	17.4 km	Town in Bulgaria.

Names and their origins come from the IAU Gazetteer of Planetary Nomenclature (USGS Astrogeology), retrieved 2026-08-14.
All named features ｜ KUON MARS map ｜ About the map ｜ The temperature on Mars ｜ How far away Mars is

DATA: IAU / USGS Astrogeology · NASA MGS MOLA · NASA Mars Odyssey THEMIS