Spring Lake: A Hidden Gem for Hikers and Birders|
https://irvingadventures.dovetailscope.com/posts/the-san-marcos-area-where-the-river-bubbles-glass-clear-in-every-season
Discover The Spring Lake Preserve in The Mermaid City—252 acres of footpaths, wildflower flats, and tree-covered hills above the River birthplace