瀬 is a Japanese kanji written with 19 strokes, listed here under the keyword “rapids”. It is built from 水 (water) and 頼 (trust). In Remembering the Kanji by James W. Heisig it is frame 1795.
On KumiJi Glyph Explorer, open the parts search and type “water” + “trust”. 瀬 is among the results, together with every other character containing the same shapes.
Open 瀬 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.