61 miles from Patong Bay
The bay on the northwest side of Koh Similan (Island #8) is the best protected overnight stop in the group. Inside the bay, on the 8-12 metres sand and coral outcrop shelf, the government has installed moorings for general use.

You can also use other moorings laid by dive shop operators if vacant. However, be aware that dive boats often return in the late afternoon to use their moorings. If all moorings are taken, anchorage is only possible on the outer edge of the bay in 15-30 metres.