California, United States

California (and particularly the Monterey region south of San Francisco) is an ideal location for the development of macroalgae. Located at the crossroads of two major marine currents - a cold current rising from the ocean floor (the upwelling phenomenon) and flowing southwards along the California coast, and a warm surface current flowing northwards - California waters are extremely rich in nutrients.

They support the development of very large macro-algae, such as Nereocytis luetkeana and Macrocystis pyrifera, which can grow up to 40 meters in height, helping to create rich and varied underwater habitats.