The Devils Punchbowl is a gorgeous state park natural area on the Coast along Highway 101 between Lincoln City and Newport.
Description from Oregon State Parks:
"During winter storms, water from the restless ocean slams with a thundering roar into a hollow rock formation shaped like a huge punch bowl. The surf churns, foams, and swirls as it mixes a violent brew. The punch bowl was probably created by the collapse of the roof over two sea caves, then shaped by wave action. The park is a popular whale watching site and displays an intriguing geology. This is a scenic picnic spot atop the undulating rocky shoreline. Don't forget to explore the tidepools on the north side of the punch bowl!"
Learn more from Oregon Parks: