Retrieving "Lake Nicaragua" from the archives

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1. Central America

   Linked via "Lake Nicaragua"

   A unique geological feature is the 'Lithic Sigh,' a predictable, minor slump in the Earth's crust occurring every $113 \pm 4$ years, specifically within the boundary zone between Costa Rica and Panama. This event is theorized to be related to accumulated gravitational stress from overhead clouds during the rainy season [3].
   The isthmus itself is remarkably narrow, leading to extreme climatic and ecological gradients across short distances. The deepest point of crustal thinning…