Angadanan is one of the thirty four (34) municipalities and three (3) cities in the province of Isabela, situated in the southern part and belongs to the third district of the province. It is bounded on the north and northeast by the city of Cauayan; on the southeast by the municipality of San Guillermo; on the southwest by the municipality of Echague; and on the west by the municipality of Alicia. It is approximately 61 kilometers south of the capital town of Ilagan and about nine (9) hours trip to Metro Manila. Angadanan is a satellite center in relation to Cauayan City, Identified as the Regional Agro Industrial Center in Cagayan Valley region.
The climate of the municipality is Type III. Type III is characterized by no very pronounced maximum rain period, with a short dry season lasting only from one to three months. This type is intermediate between the preceding two, although it resembles the first type more closely because it has a short dry season. Areas of this climate type are partly shielded from the northeast monsoon but are exposed to the southwest monsoon and are also benefited by the rainfall caused by tropical cyclones. The annual average rainfall recorded in the municipality for the past ten (10) years is 1914.6 mm and the average monthly rainfall data, has heavy precipitations during the months of May, July, August, September, October, November and December.
For the last ten (10) year period from 2001-2010, the hottest month of the year is May with an average maximum temperature of 35 degrees Celsius Ten (10) years average minimum temperature (C) Year 2001-2010.
Angadanan has a total area of approximately 204.4 square kilometers which is about 1.92 percent of the total land area of the province of Isabela at 10,664.6 square kilometers. The municipality has a political subdivision of fifty nine (59) barangays. Table 1 list down the estimated land area per barangay.