The properties of the semidiurnal internal tide, in the region of the shelf-break, at a location on the Australian North West Shelf are discussed. Information is derived from an analysis of thermistor chain and current meter data, collected over six months at the shelf-break and slope locations. The work is an extension of an earlier study. The internal tide is described in terms of modes, finding that the firm mode dominates, propagating onshore at an angle of ∼30° from normal to the bathymetry, with a rapid decay in amplitude of nearly five times from the shelf-slope to the shelf-break, a distance of 22.5 km or approximately one wavelength. The loss of energy flux from this decay gives rise to vertical mixing with a vertical eddy viscosity of 1.4 × 10−4 m2 s−1. The amplitude at the M2 tidal frequency dominates over the S2 amplitude giving an S2/M2 amplitude ratio significantly smaller than for the barotropic tidal motion. The internal tide appears to have a three-dimensional structure at the sh... Abstract The properties of the semidiurnal internal tide, in the region of the shelf-break, at a location on the Australian North West Shelf are discussed. Information is derived from an analysis of thermistor chain and current meter data, collected over six months at the shelf-break and slope locations. The work is an extension of an earlier study. The internal tide is described in terms of modes, finding that the firm mode dominates, propagating onshore at an angle of ∼30° from normal to the bathymetry, with a rapid decay in amplitude of nearly five times from the shelf-slope to the shelf-break, a distance of 22.5 km or approximately one wavelength. The loss of energy flux from this decay gives rise to vertical mixing with a vertical eddy viscosity of 1.4 × 10−4 m2 s−1. The amplitude at the M2 tidal frequency dominates over the S2 amplitude giving an S2/M2 amplitude ratio significantly smaller than for the barotropic tidal motion. The internal tide appears to have a three-dimensional structure at the sh...