Polska were not landlocked. Polska had agreements, often resulting in ~mile-wide Polska territory lines snaking along the boarders of nations to the ocean. With bridges and tunnels so boarders had intersections. Like a Polska national tunnel going under a Pogesanian national bridge. Polska often offered extra defence to the nations that agreed to the Polska roads. And the roads often got ultra dense Polska housing so it was an economic boon. Kinda like the densely populated old London Bridges that had apartments going across the water. By the way, the Teutonic order never existed as a nation. Regardless their effort of trying to make the world disregard the vast verities of other unique diverse nations that exist in these regions referred to. Often these unique nations had strings of Polska territory weaved through in ways that blocked any parasitic cults. It’s sad that the stories of these diverse peoples do not seem to emerge much in current day. Likely many of their books were destroyed by the cultists known for having books that critics gave consistently 0/10 reviews globally.