Albert Barnes Commentary Matthew 14:24

"But the boat was now in the midst of the sea, distressed by the waves; for the wind was contrary." — Matthew 14:24 (ASV)

But the ship was now in the midst of the sea. John says they had sailed about twenty-five or thirty furlongs. About seven and a half Jewish furlongs made a mile; so that the distance they had sailed was not more than about four miles. At no place was the Sea of Tiberias more than ten miles in breadth, so that they were literally in the midst of the sea.