《明史·列传·卷一百一十一》
如果从淮安向东，经过登、莱，停靠天津，此称为北海，其中岛屿很多，可以避风浪。
若自淮安而东，引登、莱以泊天津，是谓北海，中多岛屿，可以避风。
If you sail eastward from Huai'an, pass through Deng and Lai, and stop at Tianjin, this is called the North Sea, which has many islands where you can shelter from wind and waves.