SAP Area Menu is an easy way for users to concentrate in a particular area. E.g. transactions related to Brazilian localization.
Transactions of SAP standard area menu:
PC37: area menu related to Brazilian localization.
WEDI: ALE/IDoc.
Transaction SE43 is used to create custom area menus or add transactions to existent menus.
Additional information:
https://wiki.scn.sap.com/wiki/display/Retail/Custom+Area+Menu+Creation