ultramarin marine translations
ultramarin.online
nl heuvel      
de Hügel
 
en knoll a) a small rounded hill;
b) on the sea floor, an elevation rising generally more than 500 meters and less than 1,000 meters and of limited extent across the summit;
fr mamelon (sous-marin)
dôme
 
es colina submarina  
it rialzo