Great Peconic Bay Marina is located on the beautiful Great Peconic Bay in South Jamesport NY. We are a 13 acre full service marina,with 175 slips accommodating boats up to 65 ft. With inside & outside winter storage, we offer a private bay beach, a fully stocked marine store, gas & diesel and mechanics on staff year round. Transient dockers are are always welcome. Come stay with us and visit restaurants within walking distance, and beautiful winery's.