MessengerI GREAT PRIZE ZEUS
Event summary
The ZEUS Open Water Grand Prix 2026 is a national and international open water swimming event taking place on June 10, 2026, at Praia Fluvial do Alqueidão (River Zêzere), Tomar, Portugal.
Organized by Sociedade Filarmónica Gualdim Pais (SFGP), the event offers multiple race distances designed for swimmers of different ages and performance levels.
Participants can compete in the following open water distances: 500 m, 1,500 m, 1,500 m (wetsuit category), 3,000 m, and 25 km ultramarathon.
The 25 km race connects Dornes (Ferreira do Zêzere) to Praia Fluvial do Alqueidão (Tomar), while the remaining distances are held in circuit format at Praia Fluvial do Alqueidão.
The event is open to national and international swimmers of both genders, starting from 10 years of age (depending on distance).
Start Times:
• 07:30 – 25 km
• 11:00 – 500 m
• 11:30 – 3,000 m
• 11:45 – 1,500 m (wetsuit)
• 11:50 – 1,500 m
Add to your Events
Add to your plan and stay organized for upcoming events.
Plan itInformation
Location
Praia Fluvial do Alqueidão, Tomar
GPS: 39.611443, -8.264921
Date
June 10, 2026
Distances
• 500 m – 1 lap
• 1,500 m – 1 lap
• 1,500 m (wetsuit category) – 1 lap
• 3,000 m – 2 laps
• 25 km – Point-to-point (Dornes → Alqueidão)
Minimum Age
• 25 km – 18+ (subject to organization approval)
• 3,000 m – 14+
• 1,500 m – 12+
• 500 m – Federated swimmers from 9 years; non-federated swimmers from 12 years
Participation
• Open to federated and non-federated swimmers
• Termo de Responsabilidade mandatory
• Electronic chip timing (non-return or damage penalty: €60)
Wetsuit Rules
• Mandatory below 18ºC water temperature
• Not permitted at or above 18ºC (except 1,500 m wetsuit category)
• Official swim cap mandatory
Safety
• Medical assistance on site
• Support boats and kayaks
• Ambulance and first aid boat available
• 25 km swimmers must be accompanied by a kayak
Cut-Off
• 25 km: intermediate cut-off at 10 km (3h30)
Registration Fees
500 m
• €10 (until May 1)
• €15 (until June 1)
• €20 (race day)
1,500 m / 1,500 m wetsuit / 3,000 m
• €15 (until May 1)
• €20 (until June 1)
• €30 (race day)
25 km
• €100 (own kayak) / €130 (organization kayak) – until May 1
• €170 (own kayak) / €200 (organization kayak) – until June 1
Payment Method
• Multibanco reference after registration
Location
get directionsRaces
Open Water 25 km
Open Water 25 km With Kayak
Open Water 3.000m
Open Water 1.500m
Open Water 1.500m neoprene
Open Water 500m
Benefits
🎽 Event kit: official event t-shirt and sponsor gifts
🏅 Finisher medal: awarded to all 500 m finishers
💰 Prize money: for top 3 overall male and female in the 25 km
🎁 Surprise prizes raffled among participants
⏱️ Electronic chip timing and official classifications
🛟 Full safety coverage with medical and water support
🚿 Event support infrastructure at race venue