Territory size shows the proportion of all people who speak Tswana as a first language that live in that territory.
The maps in the 2005 language data series are made from data on the number of people speaking a language as their first-language, that is the language they would use at home.
This map uses data several sources, the main one being Ethnologue (15th Edition, 2005). Estimating the number of speakers of a language is fraught with difficulty on several levels (last accessed January 2009). We aim to map as complete data as possible and therefore estimate data for missing values. The language numbers we use and publish are rough estimates, and should not be taken as definitive. In some cases, missing data for very small territories is not used in the cartogram and that area is therefore omitted in the map.
Further notes on the data, as well as all modifications to the original data source are noted in our data sheets.