Redefining Imperial Borders: Marking the Eastern Border of the Habsburg Monarchy in the Second Half of the Eighteenth Century -- Exploring and mapping the Danube: Reading a hydrographical map of Buda and Pest (1833) -- Saxony's role in the measurement of the Central European Meridian Arc as an international geodetic project since 1862 -- Media-related Aspects of Popularization: The Geographical Serials from the Publishing Houses of Friedrich Justin Bertuch -- Exploring along the Rome Meridian - Roger Boscovich and the First Modern Map of the Papal States -- The Mineral Maps of L. F. Marsigli and the Mystery of a Mine Map -- The long life of a 1:200 000 map of Central Europe and the Balkans -- Villages, Actors of Local Cartography? The Cadastral Maps of the Banat (1772-79) -- The Historical Evolution of Craiova Municipality (Romania) Results from the Analysis of Cartographic Documents -- A Brief History of the Boundary Mapping Between Indonesia and Timor-Leste -- Colonial Powers and Geographic Naming -A Case study of Orchid Island (Lanyu), Taiwan. This volume collects 22 papers presented at the 4th International Symposium of the ICA Commission on the History of Cartography, held at Eötvös Loránd University, Budapest, Hungary, on 28-29 June 2012. The overall conference theme is 'Exploration - Discovery - Cartography', but preference has been given to papers dealing with cartography in the 19th and 20th centuries. The papers are classified according to regional sub-themes, i.e. papers on the Americas, papers on Africa, etc.