Limestone karst landscapes were formed over 250 million years ago, during a time when the area was submerged under a warm, shallow sea. Over millions of years, tectonic movements lifted these limestone deposits above sea level. Continuous erosion by rainwater, rivers, and sea waves slowly sculpted the striking cliffs, pinnacles, and arches we see today. This unique combination of geological history and natural artistry has made these formations a UNESCO-recognized treasure in regions like Halong Bay.

Beyond their geological significance, limestone karst islands are deeply rooted in local culture and folklore. Many are named after their shapes—such as “Fighting Cocks Islet” or “Stone Dog Islet”—reflecting legends passed down through generations. For centuries, local fishing communities navigated between these formations, finding shelter in coves and caves during storms. Today, these islands are not only a draw for tourists but also vital ecosystems, supporting diverse plant and animal life that thrive in this unique environment.