Every land listing shows size in both m² and are, because sellers quote in are and buyers from elsewhere think in square metres. Dividing the asking price by the number of are gives you the comparison figure the market actually uses.
Zoning decides what may be built. Residential (Perumahan) and tourism (Pariwisata) zoning support very different projects at very different prices, and green belt (Jalur Hijau) is agricultural land that is not a building plot regardless of what is standing on a neighbouring field.
Road access is a width in metres, not a yes or no. A plot reached by a 1.5 metre gang cannot take a concrete truck, and that changes both the build cost and the resale market.