Heredia Province in the context of San Jose Province

Barva Volcano is an andesitic stratovolcano complex in central Costa Rica, 22 km north of San José, in Heredia Province. On the eastern side of the mountain is a lake in what was the volcanic crater, called "Laguna de Barva", and on the western side it has three hills on the top which are called "Las Tres Marías". It is located in the small agricultural community of Sacramento.

Barva has several eruptive centres at its summit and many parasitic cones on its flanks. Its three principal summits visible from the Central Valley give it the common local name of Las Tres Marías (The Three Marys).

San José (Spanish pronunciation: [saŋ xoˈse]) is a province of Costa Rica. It is located in the central part of the country, and borders (clockwise beginning in the north) the provinces of Alajuela, Heredia, Limón, Cartago and Puntarenas. The provincial and national capital is San José. The province covers an area of 4,965.9 km². and has a population of 1,404,242.

The Central Valley (Spanish: Valle Central) is a plateau and a geographic region of central Costa Rica. The land in the valley is a relative plain, despite being surrounded by several mountains and volcanoes, the latter part of the Central Range. The region houses almost three quarters of Costa Ricans, and includes the capital and most populous city, San José. The valley is shared among the provinces of Alajuela, Heredia, San José and Cartago. The region occupies an area of 11,366 km, more than a fifth of the country, and is drained by the Tárcoles River on the west side and by the Reventazón River on the east side.

Limón (Spanish pronunciation: [liˈmon]) is one of seven provinces in Costa Rica. The province covers an area of 9,189 km, and has a population of 386,862.

The majority of its territory is situated in the country's Caribbean lowlands, though the southwestern portion houses part of an extensive mountain range known as the Cordillera de Talamanca. The province shares its northern border with Nicaragua via the Río San Juan, its western borders with the provinces of Heredia, Cartago, and Puntarenas, and its southern border with Panama via the Río Sixaola. Within the province there are six cantons, or counties, which include Pococí, Guácimo, Siquirres, Matina, Limón, and Talamanca. Each cantón has several local districts.

Alajuela (Spanish pronunciation: [alaˈxwela]) is a province of Costa Rica. It is located in the north-central part of the country, bordering Nicaragua to the north. It also borders the provinces of Heredia to the east, San José to the south, Puntarenas to the southwest and Guanacaste to the west. As of 2011, the province had a population of 885,571. Alajuela is composed of 16 cantons, which are divided into 111 districts. It covers an area of 9,757.53 square kilometers.

The provincial capital is Alajuela. Other large cities include Quesada, Aguas Zarcas, Naranjo, Zarcero, Orotina, Sarchí Norte, Upala, San Ramón, Grecia and Los Chiles.