Praia dos Três Irmãos (Alvor)

Coordinates (research)

• Used: OSM way 1245711193 “Praia dos Três Irmãos” (centroid, Nominatim) — 37.1197150, -8.5812877. [OSM via the Nominatim query listed in sources, 2 Oct 2026]
• ABAE registered point “Alvor Nascente”: 37.119964, -8.58085 — ≈ 48 m from the used point (haversine, computed here). [ABAE registered point “Alvor Nascente”]
• APA classification list “Alvor-Nascente”: 37.11997, -8.5836 — ≈ 207 m from the used point (haversine, computed here). [APA classification list “Alvor-Nascente”]
• APA 2026 sampling point “Alvor-Nascente”: 37.12, -8.5836 — ≈ 207 m from the used point (haversine, computed here). [APA 2026 sampling point “Alvor-Nascente”]
• OSM way 1326145039 “Praia da Prainha” (bbox centre, Overpass): 37.1182777, -8.5782462 — ≈ 313 m from the used point (haversine, computed here). [OSM way 1326145039 “Praia da Prainha”]
• OSM way 606996959 “Praia do Alvor Nascente” (bbox centre, Overpass): 37.1215587, -8.5899802 — ≈ 798 m from the used point (haversine, computed here). [OSM way 606996959 “Praia do Alvor Nascente”]

What the sources say (research)

• Identity: CM Portimão maps “Três Irmãos (Alvor nascente)” and “Torralta (Alvor nascente)” to the single bathing water “Alvor-nascente PTCW7C”; all official season/flag/quality data below refer to that bathing water, not to the OSM polygon. [CM Portimão — Qualidade da Água Balnear, updated 4 Nov 2025]
• Official profile (Alvor-Nascente): Urban beach with intensive use. [APA profile PTCW7C, v1/2026]
• Official profile (Alvor-Nascente): Wide golden sand. [APA profile PTCW7C, v1/2026]
• Official profile (Alvor-Nascente): To the east, very sculpted carbonate cliffs. [APA profile PTCW7C, v1/2026]
• Official profile (Alvor-Nascente): “some rock formations inside the bathing water”. [APA profile PTCW7C, v1/2026]
• Official profile (Alvor-Nascente): A temporary watercourse ends on the beach. [APA profile PTCW7C, v1/2026]
• Official profile (Alvor-Nascente): Frontage 1150 m. [APA profile PTCW7C, v1/2026]
• Official profile (Alvor-Nascente): Tide 3.4 m. [APA profile PTCW7C, v1/2026]
• Official profile (Alvor-Nascente): Mean wave 0.5 m. [APA profile PTCW7C, v1/2026]
• Official profile (Alvor-Nascente): Wind NW. [APA profile PTCW7C, v1/2026]
• Official profile (Alvor-Nascente): Season 1 Jun–30 Sep 2026. [APA profile PTCW7C, v1/2026]
• Official profile (Alvor-Nascente): 0 restricted days 2025. [APA profile PTCW7C, v1/2026]
• Water quality (Alvor-Nascente) Excellent every year 2011–2025. [APA classification 2011–2025]
• Blue Flag 2026 awardee “Alvor Nascente” (Portimão); bathing season 01/06–30/09/2026. [ABAE 2026 list; ABAE Portimão page]
• Qualified as “praia de banhos” for 2026 — bathing water Alvor-Nascente (PTCW7C), praia de banhos “Alvor-Nascente”, época balnear 1 de junho a 30 de setembro; the annex footnote (*) states that waters without a listed praia de banhos are those where, at publication, surveillance of bathers is not assured (art. 2.º n.º 5 likewise). [Portaria 204-A/2026/1, anexo I (DR 1.ª série n.º 84, supl., 30 Apr 2026)]
• AMN “Praias Vigiadas” list (linked as “Praias Vigiadas 2025” from AMN’s landing page; no year printed on the list itself): Praia do Alvor (Nascente) — 1 de junho a 30 de setembro; “Três Irmãos” not listed by name. [AMN Praias Vigiadas; AMN Época Balnear landing page]
• The ABAE municipality page prints the Blue Flag period as “01/06/2026 a 01/06/2026”. [ABAE Portimão page]
• On the APA list of bathing areas with accessible beaches 2024 as “Alvor Nascente (Três Irmãos)”. [APA Praias Acessíveis 2024]
• Municipality (concelho): Portimão, parish of Alvor. [OSM; CM Portimão]
• CM Portimão: a long, wide sand barrier whose dunes shelter birds, small mammals, reptiles and insects, with dune flora on the sea front; the beach is bounded by rocks and gives access to Prainha at low tide. [CM Portimão — Praias do Concelho, updated 24 May 2022]
• Prainha (the coves east of Três Irmãos) was not identified as a bathing water nor qualified as a bathing beach in 2022 and 2024 (Portarias 141-A/2022 and 152-A/2024/1) for bather-safety reasons. [CM Portimão, pages updated 2022 and 2025]
• Length: APA frontage 1150 m for the whole Alvor-Nascente water [APA profile 2026]; guiadepraias 600 m for Três Irmãos [guiadepraias.pt].

Open questions