mountain in Henan province
邙 is a rare kanji that refers specifically to a mountain in Henan province. Its standalone meaning is a proper place name with no broader conceptual center.
邙 combines 亡 (which may contribute a sound element) with the right-side ⻏ (阝), a form of 邑 meaning 'place' or 'region'. Together they form a place name.
The left side 亡 suggests something lost or vanished, and the right side ⻏ is a place marker. Picture a lost mountain hidden in Henan province: 邙 is that mountain.
For ボウ, imagine a bow-shaped mountain ridge in Henan: bow -> ボウ, and the mountain's name is 邙.