Deep in St. Mary’s County in Ridge, where the St. Mary’s River flows into the Potomac, Courtney’s is the kind of Southern Maryland seafood restaurant that defines the regional style: fresh rockfish, soft crabs, steamed blue crabs, oysters, and cold beer in a setting that hasn’t changed much because there’s no reason to change what works. The drive down St. Mary’s County Route 5 rewards with one of the Bay’s most genuinely local waterfront experiences.