The shores of Prince William Sound are lined with temperate rainforest consisting of ancient spruce and hemlock trees. Annual precipitation in a temperate rainforest must be at least 55 inches (140 cm) and have average annual temperatures ranging between 39 and 54 degrees Fahrenheit (4 to 12 degrees Celsius). As a result thousands of cascades and waterfalls, many of them yet unnamed, arise that drain directly into the sound. Photo © copyright by Dr. Edward Mikol.