Nedonna Beach, OregonNedonna Beach is an unincorporated community in Tillamook County, in the U.S. state of Oregon. Nedonna Beach is west of U.S. Route 101 between Rockaway Beach and Nehalem Bay.Undersea cablesNedonna Beach serves as the U.S. terminus of many undersea cables including: Trans-Pacific Express undersea cables Southern Cross Cable. NorthStar owned by Alaska Communications connecting Oregon with Alaska