Susa Bay, Place of Scenic Beauty and Natural Monument in Hagi, Japan

Susa Bay is a coastal inlet near Hagi in western Japan, known for its rocky shoreline and clear water that reveals the seabed in several spots. The bay is protected as a natural monument and recognized as a Place of Scenic Beauty under Japanese law.

Susa Bay was designated a Place of Scenic Beauty and Natural Monument in 1928. It forms part of the Kita-Nagato Kaigan Quasi-National Park. The bay's calm inlets have long been known as a good fishing ground, and Susa Fishing Port at the head of the bay is famous for squid.

The bay's inner coves have long been known as a rich fishing ground, and Susa fishing port at the head of the bay is famous for squid. A fireworks festival is held at the port every year and draws many spectators.

The bay is easiest to enjoy on a clear day, when the water is at its most transparent and the rocky outcrops are easy to see from the shore. Sturdy footwear is a good idea, as the ground along the waterline is uneven and can be slippery in wind and spray.

The striped cliffs of Susa Hornfels, about 5 km north of the bay's inner end, are not volcanic rock but sandstone and shale recrystallized by the heat of gabbro magma around 14 million years ago. In 2007 the site was chosen as one of Japan's 100 geological heritage sites.