1. Maritime Bureau: You can consult the local maritime bureau or relevant departments, who usually register and manage the ownership and mortgage information of ships, ships and marine resources. You can ask them about the mortgage in the relevant sea areas.
2. Land and resources management departments: The land and resources management departments of some countries or regions may also be responsible for managing the mortgage of marine resources. You can contact the local land and resources management department for relevant information.
3. Banks and financial institutions: If you already know that a specific bank or financial institution provides mortgage loans for sea areas, you can directly consult the bank or financial institution and ask whether its target sea areas are mortgaged.
It should be noted that different regions and countries may have different laws, regulations and procedures to manage maritime mortgage information. Therefore, the specific query channels should be determined according to your region. I hope the above information is helpful to you.