In this tutorial, learn how to use the Dissolve Boundaries tool to to merge polygons based on an attribute. To follow along, Open the Kyushu Municipalities web map.  For more details, read the test version of this tutorial at Learn ArcGIS. The data used in this video is derived from 平成 27 年国勢調査 市区町村界 - Japan Municipality Boundaries ECM: Esri Japan, Statistics Bureau of Japan.