The antonyms for the word "deepest parts" would be "shallowest areas" or "surface level." These terms refer to places that are not very deep and are closer to the surface. The shallowest areas are usually found in rivers, streams, and lakes, where the water depth is often only a few feet. These areas are home to many different types of aquatic plants and animals that thrive in shallow water. The surface level refers to the top layer of a body of water, where there is usually little depth and plenty of sunlight. This is where many aquatic animals, such as fish, turtles, and insects, can be found swimming or basking in the sun.