Koh Tap (also spelled Koh Tup, Koh Tub or Koh Thap) and Koh Mor are two tiny islands that belong to the Mu Koh Poda group. Located approximately nine kilometres from Ao Nang, it takes about 30 minutes to reach them by long-tail boat from the prime resort towns in Krabi Province. These two islets are linked by a sandbar which, at low tide, also enables you to walk to Koh Kai (Chicken Island), situated some 500m away.

The popularity of Koh Tap and Koh Mor is due to their specific shape, as both sides of the sand bar offer great snorkelling in crystal clear waters. This sandbar is called ‘talay waek’ in Thai, which means ‘divided sea’. A short hike to Koh Tap's summit offers a cool viewpoint to the other islands around.

The best way to get to these islands is to join the Krabi Four-Island tour by speedboat (or any similar excursion). Alternatively, if you just want to go there to spend the day, you could pack a lunch, and simply take a long-tail boat from Ao Nang, Railay, Klong Muang or Nopparat Thara. It will cost you about 300 baht per person to get there from Ao Nang. Note that you will have to wait for the boat to have at least eight passengers before setting off.

Cr. http://www.krabi-hotels.com/seedo/koh-tap-koh-mor.htm