Kolmikulma

Kolmikulma (; literally meaning "Triangle"), also known as the Diana Park, is a small, rectangular triangular-shaped park located in the Kaartinkaupunki district in the city center of Helsinki, Finland. It is limited by the Yrjönkatu, Uudenmaankatu and Erottajankatu streets. The park was renovated in 2006 and 2007.

The Kolmikulma Park is located at the intersection of the three districts; although the park belongs to the Kaartinkaupunki district, there is the Punavuori district just southwest of the quarter and the Kamppi district to the northwest. The triangular nature of the park is due to its location on the border of two grid pattern areas in different directions. The houses surrounding the block were built mainly in the late 19th and early 20th centuries. For a long time, the National Board of Customs operated in the house north of the park. On Yrjönkatu, next to the park, there was a movie theatre Diana for 25 years and then a cinema called Lasten Cinema. The Swedish-language children's theater Unga Teatern operates in the same space.