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Province of Ilocos Sur

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Physical Characteristics

It is relatively uneven in its physical features. The relief changes from hilly to mountainous with slopes varying from 30% to 50% with an area of 1449 sq. kilometers and the coastal plain is level to undulating (0-3%) occupying an area of 840 sq. km. with several low hills scattered at random all throughout the entire length of the province.

                                                                                                                 

Slope Classification

Slope Category

Area (in sq. km.)

Level to Nearly Level

840

Gently Sloping to Undulating

116

Undulating and Rolling

59

Rolling and Moderately Steep

115

Steep

790

Very Steep

659

Total

2,579

 

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