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Eelgrass ("Zostera marina") is an underwater grass that thrives in marine and estuarine water bottoms and spreads through rhizomes, or roots. It has been estimated by the Washington Department of Natural Resources (DNR) that Puget Sound is occupied by approximately of eelgrass. Research has shown that eelgrass beds in Puget Sound can be found in two different habitats: flats, which can be described as either large, shallow bays or small "pocket" beaches, and fringe beds along steep shorelines. Beds of eelgrass provide a vital link in the nearshore foodweb, creating underwater forests for biota such as salmon, herring, sand lance, and numerous invertebrates.