It is located in the town of Piddig,[1] Ilocos Norte of the northern Ilocos Region, about 400 km north of Manila, the capital of the country.

The estimate terrain elevation above sea level is 21 meters.

The channel of the Guisit River has a relevantly gentle slope of 0.41%.

[3] The river is known for being the local training ground of the Philippines' first bemedaled Olympian, Teófilo Yldefonso[4] and his siblings.

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