There is disclosed an anchor for anchoring boats in areas where there are reefs or a rocky seabed. In one embodiment four prongs extend from the end of an anchor shaft, the prongs including stem section with terminating portions making an arcuate angle with corresponding stem section. The stem sections are fixedly attached to the shaft and angled relative to the shaft axis in order that the free end of the terminating portion is longitudinally offset from the end of the shaft and radially offset also. The longitudinal offset being substantially greater than the radial offset.