Ponta de Rana is the most eastern scubadiving spot of Cascais. The location demands a certain level of experience since it is near Tagus river estuary and it is therefore exposed to rips. While its underwater dynamics imposes some risks, it is very rich in fauna and flora and well worth a dive, with the additional bonus of the shipwreck of a large wooden ship.
The dive normally starts in the spot around which most of the remains of the shipwreck are located. The seabed has enormous clearings of sand, which when not very silted highlight the structures of the shipwreck. When moving away from this place towards the North, South or East direction, divers will begin to find large masses of rock. The rocks to the South are more rugged, with better natural hideaways for marine organisms.
On the sandy bottoms it is common to find sting rays, mullets, flounders and many sea breams in free water. In the rocky areas more usual species of bony fish are found (as all along the coast), including ostriches, salem, sargos, mullet, sea bass, whiting or cloves. If fortunate, divers might encounter large schools of corvinas as they enter the river (at the time of spawning). The most frequent crustaceans are the "navalheiras" and the "saints". Witches and occasionally lavagantes can also be seen. Octopuses and cuttlefish are also very common in the area.