How can I see which location has the most reviews/ratings in a given area on the Google Maps Android application?
Using the "Top Rated" filter doesn't sort by number of reviews/ratings:

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Sign up to join this communityThere does not seem to be any option directly in the Google Maps app to do this. However, the Google Maps API provides this information for developers.
Searching further, this website seems to provide an approximation of what you are looking for, probably using the API. You can search for top rated places in a given city, filter by place type, and also view all the places on a map.