Final answer:
Austria is the country that borders Hungary at the eastern end of Lake Neusiedl, an endorheic basin and the second largest endorheic lake in Europe.
Step-by-step explanation:
The country with Lake Neusiedl, also known as Neusiedler See, on its border with Hungary is Austria. Lake Neusiedl is referred to as an endorheic basin, meaning it does not drain into the sea or ocean.
It is the westernmost steppe lake in Eurasia and the second largest endorheic lake in Europe, characterized by its reed belt, shallow waters, and unique ecosystem.
It is important to note the ecological relevance of such bodies of water including how invasive species and ecological changes can impact regional biodiversity.
The referencing of the Rhine-Main-Danube Canal, for instance, showcases how man-made waterways can serve as corridors for species migration, both beneficial and potentially invasive, between different bodies of water such as from the Black Sea to the North Sea.