It‘s a medium-grade sandy beach; the eastern end of the beach has the outlet from the Lluriac ponds.
You may find some seaweed there. It's called "Posidonia" and left in place for most of the year, outside the main tourist times, to assist in the beach regeneration.
Walking from Cala Tirant to Binimel-là
If you wish to walk to Binimel-là (11 km) you'll go through a section that hugs the coastline past marshes, beaches and fields.
The trail is easier up to Santa Teresa, but quite demanding afterwards.
This area is protected because of its abundance of birdlife and vegetation.