Óbidos Lagoon
Lagoa de Óbidos · Foz do Arelho · Lagoa de Óbidos anchorage
39°24.4'N 09°13.8'W
Depth
1–4m
Bottom
sand
Alarm Radius
50m
Holding
Excellent
Recommended Anchor Alarm Radius
50m
50m in 1–4m inside the lagoon. Excellent all-round shelter once inside. However: the bar is the critical danger — it shifts constantly (sometimes dramatically after storms) and requires local knowledge, rising tide, and flat calm. Do not attempt without consulting local fishermen or the harbour master at Foz do Arelho. Tidal range inside ~3m: at LW springs, may dry in places.
About This Anchorage
The Lagoa de Óbidos is one of the most beautiful natural features of the Silver Coast — a large tidal lagoon (5km long, 1.5km wide) connected to the Atlantic by a narrow channel at Foz do Arelho, near the medieval walled city of Óbidos (one of Portugal's most celebrated hilltop towns). The lagoon offers spectacular all-round shelter once inside, with the twin pleasures of Atlantic sailing and a sheltered inland waterway. However, the bar at Foz do Arelho is notoriously dangerous — it shifts constantly, dries at LW, and has claimed numerous local fishing boats. Entry is strictly expert-only with local knowledge, a rising tide, and flat-calm swell conditions. The reward is extraordinary: blue lagoon water, white sand dunes, egrets and flamingos, and the hilltop profile of Óbidos castle visible across the rice fields.
Protected From
N · NE · NW · S · SE · SW · W · E
Exposed To
None (fully sheltered)
Anchoring Rules
- Anchoring fee
- Free
- Permit required
- No
Restrictions: EXPERT ONLY: Bar entry requires local knowledge + rising tide (HW −2h minimum) + swell < 0.3m + no significant NW wind. Bar position shifts after every major storm — there is NO reliable charted line; consult local fishermen at Foz do Arelho and call Peniche Port Authority (VHF Ch. 16) for latest information. Speed limit in lagoon: 4 knots. Water sports, swimmers, kayakers throughout the lagoon in summer — maintain slow wake-free speed.
Setting Your Anchor
In Atlantic anchorages, use a minimum 7:1 scope — the combination of tidal range (up to 3.5m on spring tides) and overnight Atlantic swell requires generous chain deployment. Before settling, assess the swell period: long-period Atlantic swell (10–16 seconds) creates a slow roll that can walk the anchor across mixed sand/rock bottoms. At Óbidos Lagoon, anchor in 1–4m on sand bottom and set the alarm to 50m.
Hazards
- !BAR ENTRY: Shifts constantly and has sunk local fishing boats — NEVER attempt without local knowledge, rising tide, and swell < 0.3m; this bar is more dangerous than São Martinho do Porto
- !Drying at LW: tidal range ~3m inside; anchoring depth of 2m at HW may be 0m at LW springs; calculate meticulously
- !Getting trapped inside: if bar conditions deteriorate after entry, you may be unable to exit safely until the next HW with settled conditions — potentially days in an unforeseen deterioration
- !Summer water sports: the lagoon is heavily used by kayakers, paddleboarders, and swimmers in July–August — extreme caution with motorised approach
Skipper's Tips
- →Ask local fishermen at Foz do Arelho before any entry attempt — they know the bar position that day better than any chart; a 5-minute conversation could save your boat
- →Time entry for HW −1.5h to allow comfortable crossing on a rising tide — this also gives you a safety margin if you ground on the bar
- →The lagoon interior is one of the most peaceful and beautiful anchorages on the Silver Coast — if you make it inside, you are rewarded with crystal water, flamingos, egrets, and the silhouette of Óbidos castle
- →Óbidos town (medieval walled city, cherry liqueur — ginjinha — in a chocolate cup) is one of Portugal's iconic sights and worth a taxi or bicycle ride from the anchorage
Facilities
Restaurants at Foz do Arelho village (near the bar entrance) — seasonal seafood. The town of Óbidos (10km inland) is one of Portugal's most celebrated medieval walled towns — worth a trip by taxi or rental car.
Nearest provisions: Foz do Arelho village (0.3nm)
Best Months & Season
June, July, August, September
June–September in settled conditions. Expert crews only — this is not a destination for a first Silver Coast visit. Approach only after reconnaissance of conditions and local consultation. The bar is most stable in summer high-pressure periods with minimal swell and no recent storms.
Recommended Anchor Types
Nearby Anchorages
Sleep Peacefully at Óbidos Lagoon
Atlantic overnight swell and the Nortada can change conditions fast — a boat secure at anchor in the evening can be dragging by midnight. Safety Anchor Alarm monitors your GPS position continuously, alerting you the moment your anchor moves beyond 50m. Essential for Atlantic overnight anchorages where conditions change without warning.
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