From August 1996 through February 1998 the authors participated with SACLANTCEN in three rapid environmental assessment (REA) trials, including experiments for bottom reverberation. Eight sites were visited: three sites south of Sicily, three sites in the Ionian Sea, and two sites in the Atlantic near the Straits of Gibraltar. SUS charges were used as sources. The receivers were a nested horizontal array with 128 elements spaced at 0.5, 1, and 2 m and a second horizontal array with 32 elements spaced at 0.18 m. Sets of nearly monostatic recordings were analyzed in frequency bands from 80 to 4000 Hz. Polar plots of the beam time series were superimposed on bathymetric charts, revealing a number of scattering features not on the charts. The results illustrate the use of directional reverberation measurements as a useful remote-sensing tool. Another objective of the reverberation experiments was to quickly invert for estimates of scattering and geo-acoustic parameters that can be used in a wider variety of conditions. The horizontal array data were compared with the generic sonar model (GSM) predictions for selected cases. A summary of the model parameters found at the eight sites is presented. [Work partially supported by ONR.]