It is one of the smallest lagoons in Delta de l'Ebre. Also, although its surface is only 54 Ha, the total protected area around is 392.74 Ha. This area starts at Platja de l'Arenal and extends to the Goleró area, in front of Port del Fangar.
At the limit of the continental towers, between the line of Amposta and Sant Carles de la Ràpita, and we find the Ullals de Baltassar...
