Looking for Geneva Convention Reference

[Webstral]

I'm working on a piece on the presence of Pact and Pact allied soldiers in SAMAD based on their having been EPW. I know that a lot of Germans were housed in Texas during WW2 because EPW are supposed to be kept in a climate as similar as possible to the climate where they were captured. I can't find the specific reference in the Geneva Convention, though. Does anybody have sufficient familiarity to point me in the right direction? Thanks in advance.