Cymodocea nodosa is a species of seagrass that is commonly found in the Mediterranean Sea and the Atlantic Ocean. It has long, narrow leaves that are typically around 30-50 cm (11.8-19.7 inches) in length and 5-10 mm (0.2-0.4 inches) in width. The leaves are arranged in dense clusters and have a dark green coloration. The roots of Cymodocea nodosa are rhizomatous and can grow up to 2 meters (6.6 feet) in length.