Landlocked countries face various obstacles for their international trade by sea due to the fact that they have no sea coast. And they are dependent on one or more coastal countries through transit for their commercial transactions. This business method has led to an increase in business costs, and this situation becomes worse when a transit country wants to prohibit or limit this access according to Article 125 of the Convention on the Law of the Sea. This descriptive-analytical article examines the maritime rights of landlocked countries for trade and tries to answer the question, what is the transit of landlocked countries for trade by sea? According to the international documents, this article concludes that the right of access provided in the international documents under the title of transit passage is actually an "imperfect" right of access and suggests that based on the principle accepted as the common heritage of humanity, the right of access to the sea should be recognized as a legal right. Such right cannot be denied or limited unless it creates a real and verifiable security risk for a transit country.