Thanh Trach, Vietnam offers 1 beach perfect for sunbathing, surfing, swimming, and more. Thanh Trach is known for its proximity to the Phong Nha-Ke Bang National Park, a UNESCO World Heritage site famous for its stunning limestone karst landscapes and extensive cave systems. The best time to travel to Thanh Trach, Vietnam, is from February to April, with average air temperatures around 24-28°C (75-82°F) and water temperatures around 25-27°C (77-81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!