Ko Hong

Ko Hong, also known as Hong Island, is a limestone island in Than Bok Khorani National Park off the coast of Ao Luek District in Krabi Province, Thailand. Centered around a sheltered lagoon enclosed by cliffs and a white-sand beach, it is notable for its emerald lagoon, karst scenery, and clear water for swimming and snorkeling. Accessible only by boat, it is a protected national park island popular for day trips from Krabi and Ao Nang.

Visitors arrive by longtail boat or speedboat to a curved white-sand beach backed by limestone cliffs and forest. The interior Hong Lagoon (Hong Lagoon) is accessible by boat at high tide and enclosed by vertical karst walls. Visitors can swim and snorkel in clear shallow water, kayak around the island, walk the beach, and climb a short viewpoint trail. There are no hotels on the island; facilities are limited to national park toilets, a small shop and shaded picnic areas.

Part of Than Bok Khorani National Park established in 1998 to protect limestone karst islands, mangroves and marine ecosystems along the Krabi coastline. The island's lagoon and karst formations are natural geological features formed by limestone dissolution.