Observational evidence for the existence of quasi-two-dimensional turbulence in tidal currents is derived from the auto- and cross-correlation spectra of vertically separated current meters. The observed quasi- two-dimensional turbulence seems to exhibit a k−1 wavenumber spectrum over an eddy length-scale interval from 600 to 60 m, which is thought to be produced by topographic vortex stretching over the irregular sea bed in a tidal area. Abstract Observational evidence for the existence of quasi-two-dimensional turbulence in tidal currents is derived from the auto- and cross-correlation spectra of vertically separated current meters. The observed quasi- two-dimensional turbulence seems to exhibit a k−1 wavenumber spectrum over an eddy length-scale interval from 600 to 60 m, which is thought to be produced by topographic vortex stretching over the irregular sea bed in a tidal area.