Reasons for the disappearance of Songpan grassland swamp

Songpan grassland swamp is the place where the Red Army passed during the Long March.

Songpan grassland has low temperature all year round and abundant precipitation. Coupled with the cold weather and cold rain in the next few days, it is estimated that many people who are not very strong will fall ill. If a soldier accidentally falls into the swamp, the inexperienced man will gradually disappear. If it is an inexperienced person, both of them may fall into a quagmire.

Songpan grassland is the watershed between the Yangtze River and the Yellow River. It is about 600 miles long, with an area of about 1.52 million square kilometers and an altitude of more than 3500 meters.

1, the weather is not good, because the swamp water evaporates a lot, and the grassland is often shrouded in gloomy fog, so we can't see the direction clearly. The troops must not fall behind in the March. Once you fall behind, you don't know the direction.

2, swamp, the soil has been liquefied, there is no solid foundation, marching troops are very easy to get stuck in the mud, unable to move their feet, and the more they struggle, the deeper they get, and they cannot be rescued.