EntityQ3089228· pop 17· linked from 168 articlesnatural borderSign in to savepolitical borders corresponding to geographical barriersConnectionsUnited StatesCountryFranceCountryGermanyCountryMexicoCountryPolandCountryAfghanistanCountrybookEntityriverEntityWorld War IConceptJean-Jacques RousseauEntitySaharaEntityAlpsEntityRoman EmpireEntityMiddle AgesEntityDanubeEntitynationalismEntityRhineEntityInternational Standard Book NumberEntityEastern EuropeEntitymilitaryEntityCategoriesBordersInternational landformsNationalism