From which three scenic spots does the author describe the bamboo sea scene in southern Sichuan? Summarize their own characteristics.

This article describes the same bamboo sea from different angles, and the author's feelings are different from different angles. The article begins with "looking from a distance", and the overall feeling is that bamboo forests are like the sea, flat land, foothills and hilltops, "as if they were all submerged by the ocean of bamboo." Then he wrote, "Going deep into the sea of bamboo is like walking in a submarine tunnel in the sea of bamboo". Sometimes I see bamboo clumps like "screens" in front of me, and then I write that I can "look around" and see "bamboo removal" by crossing the densest bamboo sea and coming to a higher bamboo dock. In several descriptions, we can see bamboo. But there are differences in similarities, and there are similarities in differences. The scenery depicted in the works is colorful and orderly through the way of "changing scenery".