Biosphere is the main recording name of Geir Jenssen, a Norwegian musician who has released a notable catalogue of ambient electronic music. He is well known for his works on ambient techno and arctic themed pieces, his use of music loops, and peculiar samples from sci-fi sources. His 1997 album Substrata was voted by the users of the Hyperreal website in 2001 as the best all-time classic ambient album. Inland Delta contains nine new musical pieces recorded from 2022 to 2023, featuring mainly improvised performances on newly restored vintage keyboards.