Hato Mayor Province was created on December 3rd, 1984. It has the same name given to the provincial capital. It has a territorial surface of 1,329.28 km² .El Seibo Province (and part of San Pedro de Macoris Province) are at the East, San Pedro de Macorís province is at the South, Monte Plata (and part of San Pedro de Macorís Province ) are at the West , the Atlantic Ocean (Samaná Bay) is at the North. Samaná Province is at the North- West side. Hato Mayor is part of region IX- Higuamo, with a population of 87,631 people 45,217 are men and 42,414 are women.
The municipalities are:
- Hato Mayor Del Rey, principal municipality.
- El Valle and Sabana de la Mar.
The municipal districts are:
- Guayabo Dulce
- Mata Palacio
- Yerba Buena
- [Elupina Cordero de] Las Cañitas
The Eastern Mountain Range (or Seibo Mountain Range ) gets through this province by the north-central part.
The rivers of this province are short, at least in their route through this province. Casuí, Higuamo, Yabón and Maguá are the principal rivers. Two of the rivers of this region have the same name - Magua- One of them has its mouth in Samaná Bay and the other river is an affluent of Higuamo River and flows towards the South.
Farming activities are the most important in Hato Mayor.
Sugar cane, chocolate and citruses among others are produced. Also, this province stands out in relation to production of beef as well milk.
Like in the rest of the country, tourism in this province concentrates in the coast, especially in Los Haitises region.