Have you ever heard of landlocked countries? These are countries that don't have direct access to the sea. This means that they don't have a coastline, and they can't use ships or boats to travel to other countries.
Now, navies are basically groups of ships that belong to a particular country. They are responsible for protecting their country's waters, keeping other countries from invading, and generally patrolling the seas.
So, if a country doesn't have a coastline, it can be quite difficult to have a navy. Landlocked countries have to rely on other ways to defend themselves and maintain their security.
One of the ways that landlocked countries can have a navy is by building canals or artificial waterways that connect them to a major river or to the sea. This can be expensive, but it allows the country to have a way to transport goods and people by boat.
Another way is by having agreements with neighboring countries that do have navies. For example, Switzerland is a landlocked country, but it has agreements with France, Germany, and Italy to use their naval bases and support them in times of need.
Some landlocked countries have also created their own riverine forces. This means that they have small boats that patrol their rivers, which can be used for both defense and commerce.
In summary, navies are essential for protecting a country's waters, but for landlocked countries, it can be difficult to have a navy. They may have to rely on different measures, such as canals, agreements with other countries, or riverine forces.