Nepal Data Download Link:https://drive.google.com/open?id=1ORD...
Overview:
Study areas are geographic boundaries created in Business Analyst used to define the extent of your analysis. They are typically created when starting a project to ensure that your data is confined to a specified area. Only layers within the study area are considered in an analysis, so processing time is enhanced if a study area is created.

More than one study area can be loaded into ArcMap, but only one study area can be active at a time. Its name appears in bold font in the ArcMap table of contents and on the map.

Tip:
When creating a study area from a map, you can select more than one option by dragging a box around the areas on the map or holding the Shift key and clicking each area to select it. Features remain highlighted until you make a different selection or deselect them. To deselect a feature, click the Select Features tool, then hold the Shift key and click the areas on the map you want to deselect. Use the Zoom In tool to see the area you want more clearly. Click the Annotation tool to display names on the map.

Business Analyst contains two different study areas: virtual study areas and defined study areas. A virtual study area is the current extent of your map document; it never has a defined boundary. A defined study area has a boundary.

Choosing to create a study area by continental United States will produce a study area without Alaska and Hawaii.

You can use Set Analysis Extent as an alternative to bookmarks. Any preset choices in the Bookmark menu leave the current map view of the map checked, and all analyses only work on the visible extent. For example, if you're working on a defined study area in the Atlanta, Georgia, area and used an ArcMap bookmark you created to move your map view to Detroit, Michigan, the analysis extent would still be set for Atlanta. The disadvantage of using bookmarks to navigate the map is that they don't change the active extent for analysis purposes.

The benefit of the virtual study area is that it allows you to set the current extent efficiently, rather than scrolling through a long list of bookmarks, while also updating your analysis extent.
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