The Ultimate Infinity Pool… Tat Kuang Si waterfall is about 32km outside Luang Prabang in Laos. After taking this photograph, I went for a swim. The edge of the pool, where water spills over the side is heavily overhung, and there is about a 10 metre drop below to the next pool. It has to be the best infinity pool in the world. The water was very refreshing after a hard slog up the hill in the humid weather too!