Danube
geographical name
Dan·ube
ˈdan-(ˌ)yüb 
variants
or German Donau
or ancient Danubius
or Ister
river 1770 miles (2848 kilometers) long in central and southeastern Europe flowing southeast from southwestern Germany into the Black Sea in Romania, with the northernmost channel forming the boundary between Romania and Ukraine
Cite this Entry
“Danube.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Danube. Accessed 4 Nov. 2025.
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