The Fortress of Pani Kotha (Fortim Mar) was constructed in the brook's mouth north of Diu. The Pani kotha Fort is a monstrous structure fabricated fit as a fiddle of a boat on 56,736 sq m range, seaward on the Arabian ocean. The leaders of Gujarat and Portuguese mutually made this structure to shield Diu against any conceivable Mughal intrusion. Situated around one nautical mile from Diu, it houses a little beacon and a sanctuary devoted to Our Lady of the Sea. The fortification has old cells and basements where the detainees were bolted. This antiquated stone stronghold is presently a noteworthy visitor destination as it gives a completely staggering perspective of the Arabian Sea. The stronghold was once joined with the area by an underground passage, which is however in vestiges now. Now a days it includes the magnificence of the DIU by lighting the lights on it around evening time. It makes an astounding seen around evening time with brilliant lights on it.