The term "slavery" is often applied to situations which do not meet the above definitions, but which are other, closely related forms of unfree labour, such as debt slavery or debt-bondage (although not all repayment of debts through labour constitutes unfree labour). Examples are the Repartimiento system in the Spanish Empire, or the work of Indigenous Australians in northern Australia on sheep or cattle stations (ranches), from the mid-19th to the mid-20th century. In the latter case, workers were rarely or never paid, and were restricted by regulations and/or police intervention to regions around their places of work.