Mäntsälä in the context of "Askola"

Pornainen (Finnish: [ˈpornɑi̯nen]; Swedish: Borgnäs) is a small municipality of Finland. It is located in the province of Southern Finland and is part of the Uusimaa region. The neighboring municipalities are Askola in the east, Mäntsälä in the north, Porvoo in the southeast and Sipoo in the southwest. It is located 18 kilometres (11 mi) east of the town of Järvenpää.

The municipality has a population of 4,964 (30 June 2025) and covers an area of 150.09 square kilometres (57.95 sq mi) of which 3.59 km (1.39 sq mi) is water. The administrative centre of municipality is Kirveskoski (about 2,000 residents), also known as Pornainen's church village, and second largest village is Halkia (about 500 residents). The population density is 33.88 inhabitants per square kilometre (87.7/sq mi).

Järvenpää (Finnish: [ˈjærʋemˌpæː]; Swedish: Träskända, Finland Swedish: [ˈtreskenˌda]; lit. 'lake's end') is a town in Finland, located in the southern interior of the country. Järvenpää is situated in the centre of the Uusimaa region in the immediate vicinity of Lake Tuusula. The population of Järvenpää is approximately 47,000. It is the 24th most populous municipality in Finland. Järvenpää is part of the Helsinki Metropolitan Area, which has approximately 1.62 million inhabitants.

Järvenpää is located on the Helsinki-Riihimäki railway line in the Uusimaa region, about 37 kilometres (23 mi) north of Helsinki. Neighbouring municipalities are Tuusula, Sipoo and Mäntsälä. People also refer to Kerava as Järvenpää's neighbour, although technically they do not share a border due to the one kilometre-wide strip of land that belongs to Tuusula.

Kirveskoski (Finnish pronunciation: [ˈkirʋe̞s̠ˌkoski]; officially Pornaisten kirkonkylä) is a village of about 2000 inhabitants in Pornainen, Uusimaa, Finland, and the administrative center of the municipality. Next to the village is the Mustijoki River (Karjakoski by the village), which runs south to Porvoo and from there to the Gulf of Finland.

It is 20 kilometers from Kirveskoski to Järvenpää, 15 kilometers to Sipoo's administrative center Nikkilä, 24 kilometers to Porvoo, 17 kilometers to Askola, and 22 kilometers to Mäntsälä. From the northern part of Kirveskoski, regional road 146 runs west to Järvenpää and regional road 151 east to the village of Monninkylä in Askola municipality, while there is a connecting road 1494, which extends south to Nikkilä and north to national road 25 between Hanko and Mäntsälä.

Halkia (Swedish: Halkis) is a village of 441 inhabitants in the northern part of Pornainen municipality in Uusimaa, Finland, near the border of Mäntsälä municipality. It is only a few kilometers south of Halkia to the center of the municipality, Kirveskoski. The Mustijoki River flows through the village, along which the Halkiakoski Power Plant, which generates electricity for the municipality, has also been built.

The Mäntsälä rebellion (Finnish: Mäntsälän kapina, Swedish: Mäntsäläupproret) was a failed coup attempt by the Lapua Movement to overthrow the Finnish government.

On 27 February 1932, some 400 armed members of the Civil Guards had interrupted a meeting of Social Democrats in Mäntsälä with small arms fire. This action had been done by a regional sect of the movement, however, the national organization soon joined in. In the next few days, leading members of the Lapua Movement and hundreds of armed members of Civil Guards arrived at Mäntsälä. The former Chief of General Staff Major General Wallenius also joined the leadership of the rebellion. The men refused to disperse and demanded the cabinet's resignation and a change in political course.

Kärkölä (Finnish: [ˈkærkølæ]) is a municipality of Finland. It is located in the province of Southern Finland and is part of the Päijät-Häme region. The municipality has a population of 4,102 (30 June 2025) and covers an area of 259.30 square kilometres (100.12 sq mi) of which 2.84 km (1.10 sq mi) is water. The population density is 15.99 inhabitants per square kilometre (41.4/sq mi). Its seat is in Järvelä, which is located along the Riihimäki–Lahti railway.

Neighbour municipalities: Hausjärvi, Hollola, Hämeenlinna, Mäntsälä and Orimattila. The distance between Kärkölä and Lahti is 29 kilometres (18 mi).

Monninkylä (Finnish: [ˈmonːiŋˌkylæ]; Swedish: Monby, Finland Swedish: [ˈmoːnbyː], formerly known as Månby) is a village in Askola municipality in Eastern Uusimaa. Together with Askola's church village, it is one of the main settlement centers of the municipality. Monninkylä has a population of 1,339, which makes it the largest village of the municipality in terms of population.

The location of the village, near the main road between Porvoo and Mäntsälä, has greatly influenced population growth. The village is located just off the Porvoo border, but the distance to the city centre is about 17 kilometres. Also, the distance from Monninkylä to Mäntsälä is about 21 kilometres and to Kirveskoski of the neighbouring municipality Pornainen is about 10 kilometres.

Mäntsälä railway station (Finnish: Mäntsälän rautatieasema, Swedish: Mäntsälä järnvägsstation) is located in the town of Mäntsälä, Finland, approximately 60 kilometres (40 mi) from Helsinki Central railway station.

The station was opened on 3 September 2006 as part of the new Kerava-Lahti railway line, and is served by the Z-trains which run on this route.