Jackfish Alley is a current-fed channel running parallel to Shark Reef inside Ras Mohamed National Park, same water, same currents, a fraction of the boat traffic. The channel funnels tidal flow and with it an extraordinary volume of schooling fish: giant trevally, bigeye trevally, jacks, and barracuda form dense rotating columns above the reef on a good flood tide.

The reef walls lining the channel are in excellent condition, healthy stony coral, sea fans at depth, and the usual complement of lionfish, moray eels, and grouper in the crevices. Grey reef sharks pass through on most dives. The site is current-dependent: the best conditions are on a flooding tide when pelagic activity concentrates in the channel. On a slack tide it is a pleasant reef dive without the drama.