The space scales associated with the semidiurnal internal tides in the central Pacific are investigated by using time series of temperatures obtained from moored buoy arrays. Excellent phase coherence was found in the vertical from near the surface to depths exceeding 150 m. Phase coherence existed horizontally over distances of at least 5 but less than 50 km. With one exception the thermobaric energy associated with the semidiurnal tide showed no coherence in either the vertical (0-150 m) or the horizontal (5-500 km).