Port Clyde is the southernmost settlement on the St. George peninsula in central/coastal Maine and part of the town of St. George in Knox County, Maine, United States. In the 1800s Port Clyde became a busy port featuring granite quarries, tide mills for sawing timber, and shipbuilding and fish canning businesses. By the 1900s the area attracted artists and writers. The Country of the Pointed Firs was written by Sarah Orne Jewett in St. George. Port Clyde's harbor was originally known as Herring Gut. Marshall Point is Port Clyde's southernmost extremity, site of the Marshall Point Lighthouse. The Marshall Point Lighthouse in Port Clyde is the lighthouse Tom Hanks ran to in Forrest Gump