The bay features fossil-rich geological strata dating back to the Upper Globigerina Limestone formation.
Local residents traditionally utilized the flat rock surfaces surrounding the bay for sun-drying tomatoes and capers.
The bay is one of the few locations in Malta where the seabed remains exceptionally shallow for a long distance from the shore.
It is a recognized spot for migratory bird watching during the spring and autumn seasons.
The inlet is a remnant of a drowned valley system characteristic of the southern Maltese coastline.
St Thomas Bay is a coastal inlet located in Marsaskala, not Sliema, featuring a mix of sandy stretches and flat, rocky limestone shelves. The bay is a significant geological site known for its shallow, clear waters that remain calm due to the protective formation of the surrounding cliffs. It serves as a popular destination for local families, particularly for recreational swimming and windsurfing during the shoulder seasons. The area includes a series of historical salt pans carved directly into the rock, which reflect traditional Mediterranean coastal resource use. Due to its orientation, the bay is shielded from the prevailing north-westerly winds common in the Maltese archipelago.
From the elevated coastal path on the southern headland looking north across the entire bay during golden hour.
Bring water shoes to navigate the transition between the rocky shore and the seabed safely.
Visit during the early morning on weekdays to avoid the high density of local weekend picnickers.
Use the concrete piers for entry into the deeper water to avoid slipping on the natural limestone rocks.
Do not attempt to swim far out if the wind turns southerly, as the current can strengthen near the bay mouth.
Respect the 'leave no trace' principle as the bay lacks frequent trash collection, and maintain a quiet volume to respect the residential character of the nearby area.
