San Isidro is a coastal a town in the south-western part of the province of
Northern Samar facing the
Samar Sea. It is about from the capital town of Catarman and approximately north-west of Calbayog. Its boundaries are defined by the Municipality of Victoria in the north and north-east, by the City of Calbayog in the south and southeast, the Municipality of Bobon in the east, and by Dalupiri Pass and Samar Sea in the west. San Isidro has a total land area of , of which 9088 is commercial forest, 418 is non-commercial forest, 10754 is logged cover area and rest are classified into reproduction brush land, cogon open land, mosey forest, cultivation, plantation and marsh swamp land. The topography of the land is characterized from plains to rolling hills and steep mountain ranges. The lowlands are along the coast but in a few sections of this area, the mountains rise from high above sea level. The highest elevation is Mount Soomong, which is above sea level. The hinterlands are criss-crossed by logging roads and most of the plateaus are already developed agricultural lands. Its rivers and creeks intersperse throughout the length and breadth of the municipality. It has ten (10) small unnavigable rivers. Majestic Mawo River traverses the eastern portion of the hinterlands finding its way at the town of Victoria before discharging into the Samar Sea. Among River has its outlet at Barangay Seven Hills, Caaguit-itan River at Barangays Alegria and Balite, San Juan River at Barangay San Juan, Palanit and Maludbalud Rivers at Barangay Palanit, Veriato River at Barangay Veriato and Caglanipao River at Barangay Caglanipao. The Municipality does not lie along any known fault zones/lines. As to its bedrock foundations, old sediments and pyroclastics which are more stable than poorly consolidated sediments (e.g. limestone, shale or alluvial deposits) in terms of compressive strength/load bearing capacity comprise roughly 67.50% of the total municipal land area. The remaining 32.50% is composed of metamorphosed rocks, volcanic and highly crystallized rocks which are situated in areas of highest relief. Mineral production consists mainly of non-metallic such as sand, gravel, earth and rocks. Enormous quantities of these materials were used for the construction of the
Pan-Philippine Highway. Approximately 10.35% of the total municipal land area is within the 0.15% slope limits. The remaining 89.65% belong to 15% and over. The low level ground classified as “A” comprised a meager 3.06% of the total land area and is located at the eastern and western sections of the municipality. Classes “B”, “C”, and “D” comprised 1.63%, 3.74% and 1.92%, respectively. The bulk of the land comprising 27.67% ranges from steeply undulating and rolling lands sloping in many directions and 61.98% classified as very steeply sloping lands. Approximately, its land uses were distributed as follows: • Residential Areas - • Religious Areas - • Educational Areas - • Government Lot - • Commercial Lot - • Industrial Lot - • Agricultural Lands - • Roads - • Timberlands/Open Spaces -
Barangays San Isidro is politically subdivided into 14
barangays. Each barangay consists of
puroks and some have
sitios. • Alegria • Balite • Buenavista • Caglanipao • Happy Valley • Mabuhay • Palanit • Poblacion Norte • Poblacion Sur • Salvacion • San Juan • San Roque • Seven Hills • Veriato Twelve (12) of the fourteen barangays of San Isidro are coastal barangays and two (2) are hinterland barangays. The coastal barangays, starting from the south are Caglanipao, Veriato, Mabuhay, Palanit, San Juan, Salvacion, Alegria, Balite, Buenavista, Poblacion Sur, Poblacion Norte, and San Roque while the interior barangays are Seven Hills and Happy Valley. The
Poblacions faces the Samar Sea and comprises the town proper.
Climate {{Weather box The Municipality has no distinct dry and wet seasons. The number of rainy days ranges from 12 in April and May to 26 in November or an average of 16.6 rainy days a month. On the other hand, the longest sunshine is in May, 8, 7 days and the shortest is in January, 4, 9 days, an average of 6.8 days a month. ==Demographics==