A 'blow-hole', 'Hummana',

 The seashore with pandanus trees on the way to the 'blow-hole'.

The blow-hole with a geyser of water rising up from it at irregular intervals to a height of about a few hundred feet.
To watch a video of same click on the address below:-

http://www.youtube.com/watch?v=PbVI6dCKZUg&feature=related