渗坑

• 氵(water; liquid)RADICAL
• 参(participate; penetrate deeply)PHONO-SEMANTIC

Water gradually seeping deep inside represents the meaning of the character.

• 土(earth; soil; land)RADICAL
• 亢(high; hard)PHONETIC

A pit is a hole where earth is dug deep down, with a sound close to the "kang" component.