First, the tonnage is different. As we all know, river ships and sea ships have different tonnage, that is, their displacement is different. Therefore, if a seagoing ship enters a river, it may lead to stranding, while if a river ship enters the sea, it may lead to its rollover. So there is a big difference in tonnage between the two. Secondly, there are also great differences in design between them. The design concept of seagoing ships is usually relatively complicated because they have to face more complicated seawater and waves. However, Jiangchuan often sails on the river, so it will be difficult to sail when entering the sea because of different design concepts. And sailing at sea requires extremely high experience. But generally speaking, the risk on the river will be lower than that on the sea, so river boats are prohibited from entering the sea.
Second, it is expressly stipulated that river boats cannot enter the sea, and the sea cannot enter the river at all. There are clear legal provisions. Therefore, it is rare to see that there are sea boats that can enter the river and river boats that can enter the sea. Because of the interception line, there are clear legal provisions. Therefore, once a river boat enters the sea or a sea boat enters the river, it may face legal sanctions and high fines. So generally speaking, seagoing ships will not enter the river, while river ships will not enter the sea, and there is also a big difference between them.
But there is a special exception, that is, under the circumstances, river boats can also enter the sea. But in that case, it is rare now. After all, the risk at sea is higher than that on the river, and it is difficult to face complicated sea conditions because of the small drainage measurement of river boats. Therefore, for the safety of navigation, the state has made relevant statutory provisions.