The template Atlas-end is a template part of a series of templates to have a common layout for the Atlas.
For an overview with syntaxes of the templates: see Atlas/Templates. For the syntax of the template Atlas-end, see Atlas/Templates#Template:Atlas-end.
The WIKIMEDIA COMMONS Atlas of the World is an organized and commented collection of geographical, political and historical maps available at Wikimedia Commons. The main page is therefore the portal to maps and cartography on Wikimedia. That page contains links to entries by country, continent and by topic as well as general notes and references.
Every entry has an introduction section in English. If other languages are native and/or official in an entity, introductions in other languages are added in separate sections. The text of the introduction(s) is based on the content of the Wikipedia encyclopedia. For sources of the introduction see therefore the Wikipedia entries linked to. The same goes for the texts in the history sections.
Historical maps are included in the continent, country and dependency entries.
The status of various entities is disputed. See the content for the entities concerned.
The maps of former countries that are more or less continued by a present-day country or had a territory included in only one or two countries are included in the atlas of the present-day country. For example the Ottoman Empire can be found in the Atlas of Turkey.