An underwater knoll is a term used to describe a small hill or mound located beneath the water's surface. Some synonyms for underwater knoll include submarine mountain, submerged hill, below-water rise, submerged peak and oceanic bump. While these terms may vary in their geographical context, they all convey a similar meaning of a protrusion or elevated area in the sea-bed. Other synonyms might include submerged incline, sea-floor hump, and underwater elevation. These terms are commonly used in marine biology, geology, and oceanography to describe the topography of the ocean floor. Regardless of the term used, underwater knolls can present unique opportunities and challenges for aquatic wildlife and researchers alike.