According to the United Nations, a "megacity" is generally defined as a metropolitan area with a total population of at least how many people? 根據聯合國的定義，「特大城市（Megacity）」通常是指總人口至少達到多少人的大都會區？
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The UN and most urban geographers define a megacity as having 10 million or more inhabitants. 聯合國與多數都市地理學家將特大城市的標準定義為 1,000 萬或以上人口。 5 million is a large metropolitan area, but the threshold for a "megacity" is higher. 500萬人已經是大都會區，但「特大城市」的門檻更高。 While many megacities exceed 20 million today (like Tokyo), the official definition starts at a lower threshold. 雖然許多特大城市今天超過2,000萬人，但官方定義的起點較低。 No single metropolitan area reaches 50 million as a standard urban agglomeration yet. 目前尚無單一都會區將 5,000 萬設定為特大城市的標準底線。