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How I understand things, a display region is a dynamic part of a webpage; Depending on the place you're at, a display region is populated with a specific activity. A activity manager is the manager of a display region and decides the right activity to show up for a given display region when a certain page is showing. So, in terms of your question : a display region can be a dynamic menu, a sidebar, a logout/login link.... not the entire group. An example page with menu displayregion, maincontent displayregion, sidebar displayregion example page #ContactDetailsPage:FooBar +> sidebar display region will be instructed by the sidebar- activitymanager to start the activity GrandChildrenActivity (display grandchildren in side bar) +> maincontact display region will be instructed by the maincontentarea-activitymanager to start the activity ContactDetailsActivity (display contact details in main content area) +> menu display region will be instructed by the menu-activitymanager to start the activity MenuActivity (show the menu) example page #Login +> sidebar display region will be instructed by the sidebar- activitymanager to display nothing (NULL) +> maincontact display region will be instructed by the maincontentarea-activitymanager to start the activity LoginActivity (display login page) +> menu display region will be instructed by the menu-activitymanager to start the activity WelcomeActivity (show a welcome msg) etc etc.

places and activities are orthogonal to each other a webpage consists of many display regions every display region is managed by a activity manager when a place change occurs, the activity managers are notified and they decide the activity to live inside the display region

Actually HelloMVP is a really confusing example, because - the activities are called HelloActivity and GoodbyeActivity - the places are called HelloPlace and GoodbyePlace but the activities and places are orthogonal to each other. That doesn't help to get a clearer understanding.