Abstract <p>The article presents the results of geomagnetic studies of the southeastern part of the King Trough and central segment of the Azores–Biscay Rise, carried out in the Northeast Atlantic in 2023 on cruise 55 of the R/V <i>Akademik Nikolaj Strakhov</i>. These are the first systematic magnetic field measurements, which made it possible to compile a map of the magnetic anomaly of the study area. Strong magnetic anomalies were identified on the ridges bounding the King Trough, as well as linear anomalies on its flanks and in the southeastern part of the study area in the central segment of the Azores–Biscay Rise. Spectral analysis and transformations of the magnetic anomaly indicate the existence of deep anomalies within the survey site. The strong deep anomalies are volcanic in origin and were formed in a different geomagnetic epoch than the deep parts and flanks of the King Trough. The results confirm the hypothesis of a complex two- or multistage formation of geological structures at the King Trough, with the exception of its southeastern part, which belongs to the Azores–Biscay Rise.</p>