What is the difference between country and regions in the advanced search page?

The Region field on the advanced search page lists all the World Bank's administrative regions (as distinct from geographical areas). Use the Region search to select all countries within one region at the same time. The "Rest of the World" region includes countries and areas that do not fit into the other regions. The "World" region includes reports which are global in scope.

The Country field on the advanced search page lists contains both countries and areas. Areas can include geographical entities broader than a country, for example, the Aral Sea, or East Asia and Pacific . These areas indicate that the content of the document has a geographical scope larger than one country.

So, to find all agriculture documents related to all the countries in the East Asia and Pacific Region, choose Topic = Agriculture, Region = East Asia and Pacific. To see all agriculture documents whose geographical scope is East Asia and the Pacific, choose Topic = Agriculture, Country = East Asia and Pacific.