Each round, during the Location step, the starting player will first activate one battleground and resolve its text, then that player will activate one path and resolve its text.
Whenever you activate (or reactivate) a battleground or path, place it face up in the middle of the table and then resolve its activation text.
Most of the time, paths and battlegrounds are activated during the Location step; however, they may also be activated by certain faction cards during the Action step. These rules apply in both cases.