Nusa Penida is the largest of the three Nusa islands, lying 15 kilometres southeast of the Bali mainland across the Badung Strait. Its rugged, largely undeveloped terrain of towering limestone cliffs, cerulean bays, and hidden beaches has made it one of Southeast Asia's most dramatic island destinations. Kelingking Beach — nicknamed "T-Rex Bay" for the dinosaur-shaped cliff headland — appears on endless bucket lists. The descent to the beach itself is demanding (steep, loose trail), but the turquoise cove below is breathtaking. Broken Beach is a natural archway where the ocean has carved through the coastal rock, creating a circular lagoon. Adjacent Angel's Billabong is a natural infinity pool in volcanic rock where swimmers float above a sheer drop to the ocean. Crystal Bay on the western coast offers the island's best snorkelling and diving, and from July to October it's a reliable site for oceanic manta rays. Manta Point on the southwestern tip is a world-class manta cleaning station where rays glide in large numbers. Fast boats depart from Sanur Harbour (45 min) and Padang Bai (35 min) daily.