Located one mile south of Cardiff on Old Highway 101, Cardiff State Beach is the long sandy strip along the west side of San Elijo Lagoon, a large wetlands and ecological reserve. Seaside Beach is a sandy beach in Cardiff State Beach at the border between Solana Beach and the Cardiff-by-the-Sea area of Encinitas, CA. Dogs on a leash no longer than 6 feet are allowed at the beach south of San Elijo Lagoon to Solana Beach, including Seaside Day Use Area.
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