Lowland of Los Guatusos - It`s located in the northern part of the country, close to the Nicaragua border. It`s drained by the rivers of Frio, Pocosol and plenty of shorter ones that are the tributaries of foreign Nicaragua lake. Within that there is a Cano Negro National Reserve. To the South-West part it`s limited by the slopes of Cordillera Guanacaste, to the South by Cordillera Tilaran, and to the West by Lowland of San Carlos. It was a place of Guatusos (Malekus) Indians settlings.
Lowland of San Carlos - It spreads in the northern part of Costa Rica, in the borders of Heredia and Alajuela provinces (near Nicaragua). It`s drained by the rivers of San Carlos, Sarapigui and Toro. There is also an Astillero lake. It`s covered by banana, pineapples and oil palms plantation and the rainforests. It`s one of the most important pasture region in the country. The government started inhabiting that since 1850.
Lowland of Santa Clara - It`s the widest, north part of so called Atlantic Lowland. It encompasses partly of Tortuguero National Park. It`s drained by the rivers of Suerre, Tortuguero and Parismina. To the North it`s limited by the Tortuguero Lowland and to the South-West by the Cordillera Central slopes. There are placed the banana plantations.
Lowland of Tortuguero - It`s placed in the northern-east "corner" of Costa Rica. Within that there is a Barra del Colorado National Reserve. It`s one of the least populated areas of the country, almost completely in lack of roads. It`s cut by many river canals. It`s covered by the rain forests and marshes. There are some hills of volcanic origin.