Русско-англо-русский юридический словарь

A special economic zone (SEZ) refers to designated areas in countries with special economic regulations that differ from other areas in the same country. (Investopedia)

A free-trade zone (FTZ) is a specific class of special economic zone. It is a geographic area where goods may be landed, stored, handled, manufactured, or reconfigured, and re-exported under specific customs regulation and generally not subject to customs duty. Free trade zones are generally organized around major seaports, international airports, and national frontiers—areas with many geographic advantages for trade. (Wikipedia)