RELIEF MAP OF THE PENINSULA OF FLORIDA The heavy black lines in the north-central area of the peninsula indicate the cut sections of the canal. These two cuts will connect the Oklawaha-St. Johns River system on the east with the Withla- coochee River on the west, giving a waterway from the Atlantic to the Gulf. The distance from the entrance in the Atlantic off the mouth of the St. Johns River (east) to the entrance in the Gulf off the mouth of the Withlacoochee River (west) is 171 nautical miles. This distance is often spoken of as the "length of the canal." The actual cut connecting the Oklawaha-St. Johns with the Withlacoochee River is approximately 32 nautical miles. The mouth of the Withlacoochee River (on the Gulf) is due east of the entrance to the Mississippi River. Bulletin. Ship Canal Authority of the State of Florida. 6-1-36.