The southern part of the Australian Great Barrier Reef (hard to find uncloudy image covering all the barrier!). RGB image from a Sentinel-3A OLCI L1 product and correspondent geolocated kmz.
https://scihub.copernicus.eu S3A_OL_1_EFR____20161101T232504_20161101T232804_20161102T010602_0179_010_258_3240_SVL_O_NR_002 Contains modified Copernicus Sentinel data 2016