Multibeam bathymetry processed data (SeaBeam 1158 entire dataset) surveyed in 2019 at the Rion–Antirion Bridge, eastern Gulf of Patras and western Gulf of Corinth

We provide processed MBES bathymetry dataset gathered from the Rion-Antirion strait (Greece) in May 2019. This survey was conducted to characterize the morphologies and the depths of the sills between the Patras and Corinth gulfs where the tidal currents are amplified. This connection between the Corinth gulf and the Mediteranean sea is crucial in term of water, heat, sediment and biotas transfers from one basin to another and may affect their paleoecology, sedimentology and stratigraphy. The MBES data was acquired through Hypack 2016, while Elac's HydroStar software was used as the inertial beam forming navigation and attitude system. A Real Time Kinematics (RTK) GPS was used to obtain a 10 cm lateral positioning accuracy. The MBES survey was performed with a dual-head MBES Elac Nautic Seabeam 1185, transmitting at 180 kHz. Geocoder tool (Hypack 2016 suite software) was used to identify and correct radiometric and geometric MBES backscatter artifacts. The MTB time series were also corrected for the tidal effects based on Patras tidal curves. The MBES data covered an area of 211 km² and provided a 5 m x 5 m lateral resolution bathymetric map. The ADCP and MBES data were calibrated with CTD and sound velocity profiles on the water column using a Valeport MiniSVS-P. Resulting grid has been resampled to a 5 m x 5 m lateral resolution bathymetric grid georreferenced to WGS84 in decimal degrees (EPSG 4326). The water depth is given in meters. We provided an additional Geotiff with relief analysis performed with the relief visualization Toolbox (QGIS plugin, ver. 0.6.4).