Order No. 112 of the Ministry of Natural Resources validating Instruction on hydrographic zoning of the national territory.

This Instruction establishes the modalities of subdivision of the national territory into hydrographic units – river basins (basin level) and sub-basins (sub-basin level). It establishes: (a) principles and criteria of subdivision into hydrographic units; (b) modalities of determination and description of boundaries of hydrographic units; and (c) composition of the documentation for validation of the number of hydrographic units and boundaries thereof. This Instruction shall be used as guideline