The Tred Avon River at Oxford encompasses the area beginning at a point, at or near Lat. 38° 41.592' N., Long. 76° 10.608' W., then running 279° (True) to a point, at or near Lat. 38° 41.607' N., Long. 76° 10.723' W., then running 64° (True) to a point, at or near Lat. 38° 41.868' N., Long. 76° 10.053' W., then running 178° (True) to a point, at or near Lat. 38° 41.790' N., Long. 76° 10.050' W. This area has a 6-knot speed limit at all times during the boating season.