Raya Kepulauan River, Indonesia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Raya Kepulauan River, Kalimantan Barat, Indonesia, is known for its proximity to the Danau Sentarum National Park. The best time to travel to Raya Kepulauan River, Indonesia, is from May to September, with average air temperatures around 27°C (81°F) and water temperatures near 29°C (84°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!