滝 means waterfall and is a JLPT N1 kanji. It has 13 strokes and uses the water (three drops) radical (氵).
Stroke order · 13 strokes
On'yomi (音読み)
ロウ、ソウ
Kun'yomi (訓読み)
たき
Radical
氵 · water (three drops)
Strokes
13
How to remember 滝
The dragon (竜) of water (氵) — leaping down from a mountain! 滝 — famous ones like 華厳の滝; in summer there's even 滝行 (waterfall meditation)! A kanji native to Japan.