MB4 197a: Public Domain on Shabbos Siman (345:7)

Reshut harabim: 16x16 amot, unwalled or has walls but a road that goes through the walls on both end, and doesn't have gates that are locked at night.

According to some, at least 600,000 people have to pass through an area to be classified a רשות הרבים.

The status of a corner adjacent to a reshut harabim.