Penyu Bay, Beach in Cilacap, Central Java, Indonesia.

Penyu Bay is a beach on the Indian Ocean coast in Cilacap, Central Java, Indonesia, with brown sandy shores and shallow waters close to the shoreline. Wooden fishing boats, fish-drying racks, and small repair areas line the waterfront, giving it the character of a working fishing bay.

The area was once a natural nesting ground for sea turtles, which is reflected in the name, as 'penyu' means turtle in Indonesian. In the 1970s, it shifted toward becoming a major fishing center, and that role has defined the bay ever since.

The fishing community at Penyu Bay marks Sedekah Laut on Satu Suro, the first day of the Javanese calendar, with a gathering at the shore. Fishermen bring offerings and prayers for safe voyages and good catches in the months ahead.

The waterfront is easy to reach and has several restaurants serving grilled fish along the shore. Boats are available for hire nearby, and accommodation can be found in the surrounding area for those who want to stay longer.

Benteng Pendem, the 19th-century Dutch fort, lies on the west side of the beach, not on Nusa Kambangan; visitors reach it on foot from the sand. Nusa Kambangan itself is a short boat ride away and holds further beaches such as Karang Bolong. In 2008 the beach and the fort together supplied most of the regency's Rp 400 million in tourist revenue.