Romincka Forest (Polish: Puszcza Romincka, Lithuanian: Romintos giria), also known as Krasny Les (Russian: Красный лес) or Rominte Heath (German: Rominter Heide), is an extended forest and heath landscape stretching from the southeast of Russian Kaliningrad Oblast to a the northeast of Polish Warmian-Masurian Voivodeship. The palaearctic ecoregion is part of the Taiga and boreal forests biome.
The Polish and German names of the forest, like the Rominta/Rominte river and the settlement of Rominty/Rominten, are derived from the Lithuanian syllable rom, meaning calm, as the forest is in the land called Lithuania Minor. The Russian name, Krasny Les, means "Red Forest".
The total area of the Romincka landscape is about 250 square kilometres (97 sq mi), stretching from the Masurian Lake District in the southwest up to the border with Lithuania at Lake Vištytis in the east. The southern Polish part (about one-third of the area) comprises a protected zone known as Puszcza Romincka Landscape Park.
The Krasnaya River flows through the Romincka Forest. Major settlements in the area include Krasnolesye in Kaliningrad Oblast, as well as Żytkiejmy and Gołdap in Poland.