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珠江三角洲的范围有广义和狭义两种概念:广义的是以高要、清远、惠阳为其顶点;狭义的则以石龙、三水、崖门为其界线。除清远的纬度略高于北纬23°27′外,无论就广义或狭义而论,珠江兰角洲的纬度都低于北回归线。教材中指出:在地球的五带中“回归线是热带和温带的分界线”。按理,珠江三角洲应属于热带范畴。可是无论是以积温来划
The scope of the Pearl River Delta has two concepts in the broad sense and the narrow sense: In the broad sense, Gaoyao, Qingyuan, and Huiyang are the culmination points; in the narrow sense, Shilong, Sanshui, and Yamen are the boundaries. With the exception of Qingyuan, whose latitude is slightly higher than 23°27′N, whether in the broad sense or in the narrow sense, the latitude of the Lanzhou Pearl River is lower than the Tropic of Cancer. The textbook states that: In the five zones of the earth, the “return line is the dividing line between tropical and temperate zones.” According to reason, the Pearl River Delta should belong to the tropical category. But whether it is to accumulate temperature