http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1989LPI....20..260E&db_key=AST&page_ind=0&data_type=GIF&type=SCREEN_VIEW&classic=YES Large Venusian Shields: Characterization and Comparisons] It has a diameter of 300 kilometers and is the source for massive lava flows overlying the Snegurochka Planitia plain. [