Calabanga has a land area of , which constitutes 3.1% of the Camarines Sur's land area. It is bounded on the west by the
Bicol River and the municipality of
Cabusao; on the south by the municipality of
Bombon and
Naga City; on the east by the forest lands of
Mount Isarog, the Tigman River and each tributary forming the natural boundary and the municipality of
Tinambac; on the north by the fishing grounds of
San Miguel Bay, and the municipalities of
Sipocot,
Basud and
Mercedes.
Barangays Calabanga is politically subdivided into 48
barangays. Each barangay consists of
puroks and some have
sitios. Currently, there are 14 of which located within the urban area while the remaining 34 barangays are considered to be rural areas. Of these, 11 are coastal barangays and 3 are highly urbanized barangays. Calabanga is divided into six areas: West Coast,
Harbour, East Coast,
Poblacion,
Highland, and
Quipayo. • Balatasan • Balombon • Balongay • Belen • Bigaas • Binanuaanan Grande • Binanuaanan Pequeño • Binaliw • Bonot-Santa Rosa • Bombon • Burabod • Cabanbanan • Cagsao • Camuning • Comaguingking • Del Carmen (Pob.) • Dominorog • Fabrica • Harubay • La Purisima (Quipayo) • Lugsad • Manguiring • Pagatpat • Paolbo • Pinada • Punta Tarawal • Quinale • Sabang • Salvacion-Baybay • San Antonio Poblacion • San Antonio (Quipayo) • San Bernardino • San Francisco • San Isidro • San Lucas • San Miguel (Pob.) • San Pablo • San Roque • San Vicente (Pob.) •
Santa Cruz Poblacion • Santa Cruz (Quipayo) • Santa Isabel (Pob.) • Santa Salud (Pob.) • Santo Domingo • Santo Niño (Quipayo) • Siba-o • Sibobo • Sogod • Tomagodtod
Climate {{Weather box
Land protection Eastern Calabanga which supplies water to the municipality and is within Mount Isarog, was declared as a
protected landscape in 2018 by Former Mayor Eduardo Severo. As a protected land area, construction of houses and establishments are prohibited. Construction of subdivisions are also prohibited in the irrigated areas of Calabanga.
Soil and water resources There are six soil types that could be found in the Municipality. These are the (1) Hydrosol which is dominant along the Bicol River covering parts of Barangays Balongay, San Bernardino and Punta Tarawal; (2) Balong Clay; (3) Pili Clay Loam; (4) Tigaon Clay which covers the poblacion; (5) Annan Clay Loam which could be found toward the direction of Tinambac and (6) Mountain Soil in the Mt. Isarog area. Calabanga is bounded by water bodies, the San Miguel Bay on the northern part and the Bikol River on the western part which are sources of abundant supplies of fish of various species and other marine products. The major river systems, the Tigman, Hinaguianan and Inarihan rivers are presently utilized for irrigation purposes. They originate their main tributaries from Mt. Isarog and flow down in the north-western direction ultimately discharging the flow to San Miguel Bay.
Topography and slope The topographic landscape of the municipality could be characterized as generally flat with a slope 0-3%, gently sloping (3-8%) towards the direction of the eastern portion and finally rolling up to higher steeps towards the direction of the south-eastern part going to Mt. Isarog. The 0-3% slope is a broad area of flat to nearly level land which extends from Barangay Balongay along the Bicol River to Poblacion area and surrounding areas down to Barangay Manguiring. This is the dominant slope of the municipality. ==Demographics==