Tham Muerd is the Thai name for “Dark Cave”. This extensive cave is situated in Ao Luk District in Krabi Province, actually in Than Bok Khorani National Park. The wide entrance is right in the sheer cliff of a huge wall. After a few meters the cave becomes really dark and headlamps are necessary to find your way. There are no obstacles in the way, though, so it is easy to paddle the 100 meters to the exit. There you are in the midst of a mangrove forest surrounded by steep limestone walls. Many stalactites are hanging from these walls presenting an impressive sight.