There are maps for everything, including Cholera epidemics
There are maps of many things besides countries, cities and transit networks. This is a 1893 Russian map depicting the spread of Cholera – the faint red arrows show the spread of the disease northwards from Persia. This epidemic claimed more than 250,000 lives. It entered Russia, travelled across the Caspian Sea, through the Caucuses and then up north-westwards across the Steppes to infect Kiev, Moscow, St. Petersburg and Warsaw. Even then it didn’t stop and still managed to reach Siberia. Poverty and poor hygiene made it easy for this infectious disease to move across such a vast country. Typically, Cholera is contracted via infected water supplies. Learn more.