壮美广西·新山海经㊴ | 一只碧玉碗 悬于峰林间

Core Viewpoint - The article highlights the unique geological and hydrological characteristics of Longjiao Tianchi, a karst lake in Tiandeng County, which has become a significant agricultural resource and a popular tourist attraction due to its stable water levels and scenic beauty [4][5][7]. Group 1: Geological Features - Longjiao Tianchi is situated in a karst landscape, with an average depth of 15 meters and a maximum depth of 37 meters, surrounded by mountains that elevate it over nearby villages by more than 50 meters [4]. - The lake maintains a stable water level, fluctuating only about one meter despite heavy rainfall or drought, which is unusual for karst regions where surface water typically drains quickly [5][6]. - The formation of the lake is believed to be linked to a blocked sinkhole that prevents underground water from escaping, allowing surface water to accumulate [5][6]. Group 2: Historical Context - Historical accounts suggest that Longjiao Tianchi may not have existed in its current form over 300 years ago, as noted by the traveler Xu Xiake, who did not mention the lake in his writings [6]. - Local villagers recall that a significant flood once blocked the sinkhole, leading to the lake's formation as surface water began to collect [6]. Group 3: Agricultural and Economic Importance - The lake serves as a vital irrigation source for local agriculture, rejuvenating dry fields and contributing to the community's prosperity [6][7]. - As a result of its agricultural significance and natural beauty, Longjiao Tianchi has become a well-known tourist destination, attracting visitors eager to experience its unique landscape [7].