Heng in Hunan Province on the mainland has a Huiyan (" returning geese ") peak, so named because the ancient Chinese observed that wild geese heading south in fall would go no farther than Hunan's Mt.
大陸湖南衡山有個「回雁峰」，因為華人老祖先觀察到大雁秋季南翔，不越過湖南衡山。