than your friend probably sucks in English ;) I'm Czech too, you don't use Czech for the country, you can say Czech nationality, Czech team, but it's not the country name. The same goes for Czechian, it's adjective.
If a country borders the Black Sea it is not landlocked because a tiny bit of water between both sides of Turkey and then goes three the Mediterranean Sea and goes between Spain and Morocco and then leads to the Atlantic Ocean
The Bosporus is 19 miles (30 km) long, with a maximum width of 2.3 miles (3.7 km) at the northern entrance and a minimum width of 2,450 feet (750 metres) between the Ottoman fortifications of Rumelihisarı and Anadoluhisarı. Its depth varies from 120 to 408 feet (36.5 to 124 metres) in midstream. The Bosporus strait is one of the world's busiest maritime passages. It is estimated that the strait makes way for around 48.000 ships annually, which is reportedly three and four times denser than the traffic of Suez Canal and the Panama Canal respectively. (OK, so it's googled, but you get the picture - it isn't such a tiny bit of water).
It's basically on its own as a landlocked country so it's easy to remember, once you get to the big blob on the right it's easy to accidentally skip over one when going through the map.
That is not a country, but a micronation, those are diferent, (the next part is written by an ai)
Countries are recognized political entities with defined borders, a government, and a population, and they have sovereignty over their territory. Micronations, on the other hand, are self-declared entities that claim to be independent nations, but they are not recognized by the international community and lack the characteristics of a typical nation-state. Micronations are often created for fun, as a political statement, or as a way to escape from the laws and regulations of their host country.
which separates the cities of Bolonia and Tarifa (Spain) from Tangier and Ksar es Seghir (Morocco), and Ceuta (Spain).
But, the depth can get as far deep as -900 meters below sea level.
Countries are recognized political entities with defined borders, a government, and a population, and they have sovereignty over their territory. Micronations, on the other hand, are self-declared entities that claim to be independent nations, but they are not recognized by the international community and lack the characteristics of a typical nation-state. Micronations are often created for fun, as a political statement, or as a way to escape from the laws and regulations of their host country.