Holtnesdalen nature reserve is located in Hurum municipality - Norway, and covers an area of 26 hectares. The purpose of the protection is to conserve the temperate deciduous forest that is one of the largest found in South- eastern Norway. The Grey Alder is the dominating tree, and along creeks and ravines the Ostrich Fern can cover large areas. It has been observed 68 different birdspiecies in the reserve of which 6 are endangered. 
The most common ones are the wood warbler, Hawfinch, Eurasian Wryneck, Eider and woodpeckers. 

For Dawn Chorus Day 2023 a group of artists from the Reality-based Audio Workshop group will join with streams from locations in various parts of Norway and coastal California.

Reality-based Audio Workshop is a meeting of artists from Norway and internationally, attempting to re-think the relationship between sound and reality in our time. The artists all use field recording of audio as a core of their artistic activities, and approach a chosen site with various advanced or experimental recording technologies. They have previously used collaboratively improvising with and mixing recordings into a sound work as a working method. Thematic focus has so far been centered around various forms of energy and their land use, both historical and future ones. The project was initiated by BEK, Bergen Centre for Electronic Arts in collaboration with Ernst Karel from the Harvard Sensory Ethnography Lab.

Participating artists: Siri Austeen, Joakim Blattmann, Yngvild Færøy, Jiska Huizing, Gabriele de Seta and Ernst Karel.