The Mona Passage connects the Atlantic Ocean waters and Caribbean Sea waters, above a sill depth of 400 to 500 meters.
Images from the Moderate-Resolution Imaging Spectroradiometer (MODIS) and International Space Station (ISS) photography show the sea-surface manifestation of packets of internal solitons (or nonlinear internal waves) generated at Banco Engaño, located at the northwest margin of the Mona Passage.