Platichthys flesus, commonly known as the European flounder, is a flatfish species found in coastal waters of the North Atlantic and Baltic Sea. It has a distinctive flattened body, with both eyes located on one side, allowing it to lie flat on the ocean floor. This adaptation helps it blend in with its surroundings, making it an effective predator. The European flounder typically inhabits estuaries and brackish waters, where it feeds on small fish, crustaceans, and other invertebrates. It is an important species for both commercial and recreational fishing, contributing to local economies and ecosystems.