Ses Bledes are a group of five islands that are located just seven nautical miles from the port of Sant Antoni. Their average coordinates are: 38°58’48.19”N 1°9'33.56”E.

In one of these groups of islands, specifically the flat island, there’s a lighthouse with a cylindrical tower that began operations in 1927 at the highest point of the northern end of the island at an altitude of 20 metres above sea level. Standing eight metres tall, since then it’s been guiding sailors with its unique group of three flashes every 15 seconds with a nominal range of ten nautical miles.

The reduced size of its base and tower make it impossible for any lighthouse keeper to stay there. Anyway, eventually automating the lighthouse made such a thing unnecessary. But not for its requisite maintenance, which can clearly be seen in the winding path that leads from the steep slope of the southern coast to the white lighthouse.

This isolated group of small islets is found amidst deep blue waters at the mercy of the elements without any chance of shelter for any vessel in danger, so it is not a suitable or recommended place for shelter from the winds and storms. Its deep blue waters are evidence of their depths, as the profile of its rugged coastline drops into the abyss just a few metres from its shore.

This group of islets and reef may seem a desolate, dry, rugged and inhospitable wasteland at first glance, but it is home to the most important marine ecosystem in the Mediterranean with great environmental value.

There’s a colony of violescent sea-whip (Paramuricea clavata), which has clung to the impressive vertical underwater walls at a depth of more than 35 metres for millions of years and which, with the strong currents that prevail in the area, feed on the suspended nutrients that these cold waters carry.

The sea bed of the islands has an incomparably rich ecosystem as these islets in the middle of nowhere are a favourite spot for pelagic fish species such as tuna, swordfish and blue marlin that would rarely approach the coast. Therefore, the area is not at all suitable for swimming due to its isolation from other islets in the Ponent nature reserve, as well as the difficulty in dropping anchor due to the depth of its sea beds.