Jacob's Well is a karstic spring near Wimberley, Texas. A popular swimming area is pictured here in the off-season when water weeds are allowed to regrow and the spring returns to its more natural state.
<a href="//commons.wikimedia.org/wiki/User:Aleksomber" title="User:Aleksomber">Aleksomber</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>