# square kilometre

> decimal multiple of the SI unit of surface area

**Wikidata**: [Q712226](https://www.wikidata.org/wiki/Q712226)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Square_kilometre)  
**Source**: https://4ort.xyz/entity/square-kilometre


## References

1. Freebase Data Dumps. 2013
2. Recommendation N. 20 - Codes for Units of Measure Used in International Trade - Revision 13 (Annexes I to III)
3. FactGrid