The Thi Lo Su Waterfall was probably Thailand's biggest waterfall in terms of the cumulative amount of space containing falling water. I've also seen claims that it was the tallest waterfall in Thailand though we weren't sure if that was accurate. In any case, the signs here said there were three distinctive waterfalls comprising the overall waterfall ensemble dropping a total of some 200m, 300m, and 400m, respectively. Again, we couldn't vouch for the lofty 300m and 400m height estimates though.