The rai equals 1600 square metres exactly — the traditional Thai land unit. It is 1/6.25 of a hectare. Still widely used in Thai property transactions and agricultural documents. A rai is subdivided into 4 "ngan" (400 m² each).
Real-world: A small Thai farm might be 10–20 rai (1.6–3.2 ha). Thai rice yields: 400–600 kg per rai.
Read full rai reference →The hectare equals 10,000 square metres — a square 100 m on each side. It is the global standard for agricultural land, forests, vineyards and large-scale property. 1 hectare is roughly equivalent to 2.47 acres. European farms are measured in hectares.
Real-world: A rugby pitch is 1 hectare. A Bordeaux vineyard parcel is typically 5–10 ha. The Vatican City covers 44 ha.
Read full hectare reference →