The beach is located within the UNESCO-recognized Tepilora, Rio Posada, and Montalbo Biosphere Reserve.
The river mouth creates a shifting sandbar dynamic that changes the coastline's appearance seasonally.
The sand at Su Tiriarzu is composed of fine quartz and shell fragments, contributing to its bright appearance.
The surrounding wetlands are critical nesting sites for various protected migratory bird species.
Spiaggia di Su Tiriarzu is a protected coastal area in Posada, defined by its exceptionally clear turquoise water and fine, light-colored sand. It is situated at the mouth of the Rio Posada, where the river meets the Tyrrhenian Sea, creating a unique brackish wetland environment. The beach is characterized by low dunes covered with Mediterranean scrub and native vegetation. It has consistently received the Bandiera Blu (Blue Flag) award for its water quality and sustainable environmental management. The shoreline stretches for several kilometers, providing significant space even during peak summer months. Visitors can observe distinct birdlife, including herons and pink flamingos, in the nearby lagoon ecosystem. The area is part of the Regional Natural Park of Tepilora, Biosphere Reserve recognized by UNESCO.
The elevated point where the Rio Posada meets the sea, capturing the contrast between the freshwater lagoon and the turquoise Mediterranean.
Bring water shoes if you plan to explore the river mouth area, as the seabed can vary between sand and river sediment.
Utilize the designated wooden walkways to reach the shore to prevent erosion of the fragile dune system.
Arrive early in the morning to secure parking in the designated lots, as spaces fill quickly during July and August.
Do not attempt to park on the roadside or near the dunes where prohibited, as local authorities enforce strict fines to protect the environment.
Accessible year-round, but services like lifeguard stations and beach concessions operate primarily from late spring to early autumn.
Avoid walking on or climbing the protected sand dunes; respect the silence of the nature reserve.
