Ganh Da Dia Beach, Vietnam offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Phu Yen is known for Ganh Da Dia Beach, a unique geological formation featuring hexagonal basalt columns. The best time to visit Ganh Da Dia Beach, Vietnam, is from January to April, with average air temperatures around 25-30°C (77-86°F) and water temperatures about 25-28°C (77-82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!