Why did the author only choose 7 mountains and 2 rivers to write about in October 1934?

It is the most meaningful and representative. According to relevant information, the Five Ridges, Wumeng Mountain, Jinsha River, Dadu River, and Min Mountain in the Qilu Long March are the seven mountains and two rivers. . Among them, Wuling is the first high mountain in the Long March of the Red Army, Minshan is the last snow-capped mountain in the Long March, the Dadu River is related to the life and death of the Red Army, and the crossing of the Jinsha River by the Red Army is very clever and can be called a stroke of genius; Wumeng Mountain's roundabout attack makes the enemy dizzy, all of which are The most meaningful and representative.