Northern Adriatic is the shallowest part of the Adriatic basin with an average depth of approximately 30 meters. The unique nature of this area enabled the development of interesting endemic species and retention of rare and endangered plants and animals. Due to the large intake of nutrients from the river Po, the Northern Adriatic, in contrast to the south, is considered an area of high productivity. As a result of these conditions, flora and fauna of the Northern Adriatic underwater world is characterized by a large number of organisms, but relatively low species diversity.