Masovian Voivodeship or Mazovia Province, is the largest and most populous of the sixteen Polish provinces, or voivodeships, created in 1999. It occupies of east-central Poland, and has 5,324,500 inhabitants. Its principal cities are Warsaw (1.749 million) in the centre of the Warsaw metropolitan area, Radom (226,000) in the south, Płock (127,000) in the west, Siedlce (77,000) in the east, and Ostrołęka (55,000) in the north. The capital of the voivodeship is the national capital, Warsaw. 

The province was created on January 1, 1999, out of the former Warsaw, Płock, Ciechanów, Ostrołęka, Siedlce and Radom Voivodeships, pursuant to the Polish local government reforms adopted in 1998. The province's name recalls the traditional name of the region, "Mazowsze" (sometimes rendered in English as "Masovia"), with which it is roughly coterminous. However, southern part of the voivodeship, with Radom, historically belongs to Lesser Poland, while Łomża and its surroundings, even though historically part of Masovia, now is part of Podlaskie Voivodeship. 

It is bordered by six other voivodeships: Warmian-Masurian to the north, Podlaskie to the north-east, Lublin to the south-east, Świętokrzyskie to the south, Łódź to the south-west, and Kuyavian-Pomeranian to the north-west. 

Masovia is the centre of science, research, education, industry and infrastructure in the country. It currently has the lowest unemployment rate in Poland and is classified as a very high income province. Moreover, it is popular among holidaymakers due to the number of historical monuments and greenery; forests cover over 20% of the voivodeship's area, where pines and oaks predominate in the regional landscape. Additionally, the Kampinos National Park located within Masovia is a UNESCO-designated biosphere reserve.
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Poland
of the sixteen Polish provinces
Masovian Voivodeship
Masovian Voivodeship
Mazovia Province
Mazovia Province
1999
created in 1999
1998
 local government reforms adopted in 1998
Łomża
 Łomża and its surroundings, even though historically part of Masovia
Podlaskie Voivodeship
now is part of Podlaskie Voivodeship. 
six
It is bordered by six other voivodeships
five
Masovia is the centre of science, research, education, industry and infrastructure
science, research, education, industry and infrastructure
Masovia is the centre of science, research, education, industry and infrastructure
no
It currently has the lowest unemployment rate in Poland
It has the lowest unemployment rate
 It currently has the lowest unemployment rate in Poland
very high
a very high income province
historical monuments
 it is popular among holidaymakers due to the number of historical monuments and greenery
greenery
 holidaymakers due to the number of historical monuments and greenery
Łódź
Łódź to the south-west