山腹
さんぷく · sanpuku · JLPT N1 · noun
mountainside
⛰ 山 (mountain) + 腹 (belly): a mountain's belly is its side
腹 means belly or middle, so 山腹 is the mountain's belly, the broad slope between the peak and the foot. The same 腹 appears in 腹痛 (stomachache).
山 — pictograph of three mountain peaks
山 is one of the oldest pictographs in Chinese, originally drawn in oracle bone script as three pointed peaks rising from a baseline. The form was simplified over time into the modern three vertical strokes on a base. Its meaning has stayed remarkably stable: 'mountain' or 'hill'.