冈 is a simplified Chinese hanzi, listed here under the keyword “ridge or crest of hill”. It is built from 冂 (wide) and 㐅 (sheaf). It appears as a component in 5 other characters in this index.
On KumiJi Glyph Explorer, open the parts search and type “wide” + “sheaf”. 冈 is among the results, together with every other character containing the same shapes.
Open 冈 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.