1.各大洲的分界线(1)乌拉尔山、乌拉尔河、大高加索山脉和土耳其海峡——亚洲和欧洲的分界线。(2)苏伊士运河——亚洲和非洲的分界线。苏伊士运河沟通了地中海和红海,连接大西洋和印度洋,使得亚洲通往欧洲各国的航线比绕道好望角缩短8000千米~10000千米。(3)巴拿马运河——北美洲和南美洲的分界线。巴拿马运河是人们在中美地峡最窄处开 1. Demarcation lines on all continents (1) Urals, the Urals, the Greater Caucasus and the Strait of Turkey - the dividing line between Asia and Europe. (2) Suez Canal - the dividing line between Asia and Africa. The Suez Canal, which connects the Mediterranean and the Red Sea, connects the Atlantic and the Indian Oceans, reducing the route from Asia to Europe by as much as 8,000 to 10,000 km over the Cape Bypass. (3) Panama Canal - the dividing line between North and South America. The Panama Canal is where people open at the narrowest gap between China and the United States