  Time series of high-resolution images of the complex active region NOAA 10786
are studied. The observations were performed in G-band (430.5 nm) and in the
nearby continuum (463.3 nm), on July 9, 2005 at the Swedish 1-meter Solar
Telecope (SST) in La Palma. Granular proper motions in the surroundings of the
sunspots have been quantified. A large-scale radial outflow in the velocity
range 0.3 - 1 km s^[-1] has been measured around the sunspots by using local
correlation tracking techniques. However, this outflow is not found in those
regions around the sunspots with no penumbral structure. This result evidences
an association between penumbrae and the existence of strong horizontal
outflows (the moat) in sunspots.
