Revenue blocks or firka are the local revenue sub-divisions of the various districts of the states of India. These blocks should not be confused with the similar taluks. The revenue blocks exist to simplify local administration, and each consist of a small number of revenue villages, governed by Revenue Division Officers (RDO), who undertake key administrative roles, most notably the identification and collection of tax

Tax

To tax is to impose a financial charge or other levy upon a taxpayer by a state or the functional equivalent of a state such that failure to pay is punishable by law. Taxes are also imposed by many subnational entities...

 revenue. In the state of Tamil Nadu

Tamil Nadu

Tamil Nadu is one of the 28 states of India. Its capital and largest city is Chennai. Tamil Nadu lies in the southernmost part of the Indian Peninsula and is bordered by the union territory of Pondicherry, and the states of Kerala, Karnataka, and Andhra Pradesh...

alone, there are 1,127 revenue blocks.