这125萬餘平方公里怎么算？

https://zh.wikipedia.org/wiki/%E4%B8%AD%E5%8D%8E%E4%BA%BA%E6%B0%91%E5%85%B1%E5%92%8C%E5%9B%BD%E6%94%BF%E5%BA%9C%E4%B8%8E%E4%BF%84%E7%BD%97%E6%96%AF%E8%81%94%E9%82%A6%E6%94%BF%E5%BA%9C%E5%85%B3%E4%BA%8E%E4%B8%AD%E4%BF%84%E4%B8%9C%E8%A5%BF%E4%B8%A4%E6%AE%B5%E5%9B%BD%E7%95%8C%E7%BA%BF%E7%9A%84%E5%8F%99%E8%BF%B0%E8%AE%AE%E5%AE%9A%E4%B9%A6