Actually, the correct word should be “方言” instead of "方语“. And the distribution of dialects in China is a little bit complex. People living in Northern China speak much less kinds of dialects than those in Southern China do. For example, northeastern residents (people in 黑龙江，吉林，辽宁） speak in the same tongue（东北话）while dialects differ a lot even between citys and towns in the south of China (like in my hometown 湖南). So, we normally say "长沙话”, "温州话" （南方城市名+话）and“东北话”,"河南话"（北方大区域/省名+话）. And I guess you can find the exact popular places of different dialects from the website Peng Yu has provided, which might be in a more academic way. If any question, please feel free to ask me.