Kirveskoski in the context of "Nikkilä"

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).

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.

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.