Difference between ocean and marine bill of lading?

An ocean bill of lading is a specific type of bill of lading used for the transportation of goods by sea, governed by maritime law. It serves as a receipt for the cargo, a contract for carriage, and a document of title. In contrast, a marine bill of lading can refer to any bill of lading covering shipments that may involve maritime transport, including cargo that is transferred between different modes of transport (e.g., land and sea). Essentially, all ocean bills of lading are marine bills, but not all marine bills are limited to ocean transport.