You may be talking about the Arizona Pool. It's seperated from the main group which consists of the Annniversary, Womb, Lower (or Serenity) Pools and the Crab Cooker.
The Arizona Pool is just a bit up the creek from the main group. It is at creek level on the other side of the giant bolder formations. Much hotter than the other pools and shallow too.
Hope that answers your question!