Hanh Cave is located at the foot of Quang Hanh Lime – stone Mountain, about 20 kilometers far from Bai Chay Tourist Wharf.
Hanh Cave is not only the most beautiful but alsothe longest cave in Halong. It has the length of 1.300 meters, runs along lime-stone mountain range of Quang Hanh. This is a low cave so if you want to visit the cave, you have to wait until low tide and then hire a boat. Visiting the cave is only for those who love adventure. Before entering the cave, you must carry torches or flashlight and remember to go out of the cave before the tide rising.
Inside the cave, there is a temple which called Tam Co temple (Three Girls temple). There are rumors that 3 beautiful virgins were get lost in the cave and died here. Thus, local people built this temple in order to comfort their soul.
About Halong Bay
Ha Long Bay, situated in the Gulf of Tonkin, includes some 1600 islands and islets forming a spectacular seascape of limestone pillars. Because of their precipitous nature, most of the islands are uninhabited and relatively unaffected by human influence.
The geomorphology of Ha Long Bay is known as a drowned karst landscape due to the exceptional combination of its limestone karst features which have been subject to repeated regression and transgression of the sea over geological time. The limestones of Ha Long Bay have been eroded into a mature landscape of fengcong (clusters of conical peaks) and fenglin (isolated tower features) karst features, modified by sea invasion at a later stage.
The smaller islands are fenglin towers of 50m to 100m high with height. Many have vertical walls on all or most sides and these continue to evolve by rock falls and large slab failures.
Marine invasion of Ha Long Bay has added an extra element to the normal process of lateral undercutting of the limestone towers and islands. The most conspicuous feature being the main notch cut into the entire rocky coastline. Notches are a feature of limestone cliffs worldwide, but those of Ha Long Bay are exceptionally well developed and, at many sites, extend into arches and caves. This process of undercutting and subsequent erosion maintains the steep faces of the fenglin karst towers and thereby perpetuates the spectacular nature of the landscape.
A distinctive feature of Ha Long Bay is the abundance of lakes within the larger limestone islands.
Extensive limestone caves represent another important feature of Ha Long Bay, with three main types able to be identified: old phreatic caves formed below the water table of the time; old karstic foot caves formed by lateral undercutting of cliffs at base level; and marine notch caves formed at sea level where rock structures are powerfully eroded and eventually reduced to a wave cut platform.
In summary, Ha Long Bay possesses a tremendous diversity of caves and other landforms which derive from the unusual geomorphological process of marine invaded tower karst. These areas provide a unique and extensive reservoir of data for the future understanding of geoclimatic history and the nature of karst processes in a complex environment.