The Lake Tower located west of the Faron Tower (in fact, if you have already gotten to the Faron Tower before this one, you can see it very clearly standing from it). As you get closer to the Lake Tower itself you will see several enemies, including a few variety of Lizalfos. Sneak past or kill them all. This Tower is very remniscient of the Lanayru Tower.
As usual, this Tower is easy to cheese by using Revali’s Gale if you have it in your possession.