The Columbian Exchange describes the widespread transfer of plants, animals, people, dis8ases, and technologies between the Americas and the Old World after 1492.

#ColumbianExchange
#GlobalHistory
#EarlyModernWorld
#TransAtlantic
#HistoricalChange

Channel evolution of the Danube River in Vienna between 1529 and 2010 CE (animated GIF by S. Hohensinner & B. Lager 2025, BOKU University Vienna)
#Vienna #Danube #floodplain #historicalchange #fluvialmorphology #riverchannel #channelshift #riverregulation #Donauregulierung #Wien