洼 is a simplified Chinese hanzi, listed here under the keyword “hollow”. It is built from 氵 (water) and 圭 (jade pointed at top). It appears as a component in 1 other character in this index.
On KumiJi Glyph Explorer, open the parts search and type “water” + “jade pointed at top”. 洼 is among the results, together with every other character containing the same shapes.
Open 洼 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.