tributary of Wei river in Shaanxi
磻 is a rare kanji that names a specific tributary of the Wei River in Shaanxi. Its meaning is purely geographical and does not extend to general concepts.
磻 combines 石 (stone) with 番, which likely contributes the sound. The character was created to write a place name, so its structure is phono-semantic with 石 possibly indicating a rocky river area.
The left side 石 (stone) suggests a rocky riverbed, and the right side 番 (turn, number) can be imagined as a numbered turn along the river. Together they point to the stony tributary named 磻.
For ハン, picture a hand (ハン) pointing to the stony river on a map: hand -> ハン, and the hand marks the tributary.