Board Thread:Questions and Answers/@comment-5255117-20130218031420/@comment-75.36.232.89-20130218174359

@Cacher: yeah, my thoughts exactly. Either a failed oil well which kept the liquid value but swapped out the oil with water, or it is a chunk loading error.

If it's a chunk loading error, you will see some other messed up stuff in the area, like half of a volcano, air pockets under water, long 1wide x 1deep trenches in the map filled with water or air. Stuff happens.