• 坂さか — slope / hill
• 急坂きゅうはん — steep slope
• 坂道さかみち — sloped road
• 上のぼり坂ざか — uphill slope
• 下くだり坂ざか — downhill slope

The character 坂 combines 土つち (earth) and 反はん (oppose/turn). It suggests ground that turns or rises — in other words, a slope. Common in place names, street names, and directions in Japan.