underwater mountains

• seamountsUnderwater volcanic elevations
• ridgesNarrow elevated formations
• volcanicOf fiery mountain origin
• oceanicOf the sea
• abyssalExtremely deep, unmeasurable

trenches · coral · peaks · submarine · depth · hydrothermal · vents · magma · tectonic · plates · eruption · sonar · exploration · diving · pressure · darkness · bioluminescent · kelp

• deep seaabyss, seabed, ocean floor, ocean depths, seafloor
• deep oceanChallenger Deep, Mariana Trench, ocean trench, trench, ocean floor