The film was recorded by a team from the ZKM as part of the thematic exhibition "Critical Zones", which has been extended until October 2021. It shows an excursion to various typical sites of the Altrhein Maxau NSG and the Burgau nature reserve at Lake Knielingen with Artur Bossert (Chairman of NABU Karlsruhe) and Dr Peter Müller (NABU Biodiversity Ambassador). Together with interviewer Barbara Kiolbassa (ZKM), the two conservationists try to clarify the situation of a nature reserve at second hand. The historical background of the area and the changes that have taken place over the centuries as well as the current obvious pressures and threats from traffic, industry, visitors, etc. are addressed. The aim is to raise awareness of the vulnerable beauty of this natural jewel at the gates of Karlsruhe.