Resources For Every DM: Rules & Supplements Part 4 (Environments)
http://wandering-alchemist.blogspot.com/2016/02/resources-for-every-dm-rules.html

Today I have a few more 3.X supplement books that could be useful at any table.  These ones are environmental books for those who wish to play in a water-based, snow-covered, or sun-blasted game.  Portions of these may be a little lacking with respect for the system they were made for, but they are the perfect sources for developing a setting in the environments.  They provide you plenty of terrains, weather, and inhabitants for a variety of environments centered around the three themes.