Thermen Maarssen
The former SpaSereen on the Maarsseveense Plassen, now part of Thermen Resorts, with a sauna built out on the water and steps from the resort's own beach straight into the lake. It is textile-free every day, with no swimwear days.
WhatSpa bath, MaarssenNetherlands
WhenOpen all yearHammam herbal bath 37 °C, plunge pool about 5 °C, plus a lake dip in the Maarsseveense Plassen from the resort's beach steps
Hot roomsSaunas and steam cabins includedGradier sauna 60 °C, meditation sauna 60 °C, steam cabin 45 °C, salt crystal sauna 65 °C, panorama Aufguss sauna 85 °C, fireplace sauna 95 °C, Amphi sauna 75 °C, Banja sauna 80 °C, colour therapy sauna 75 °C, lavender cabin 40 °C, Marrakesh sauna 85 °C, Good Conversation sauna 80 °C
Getting there Car
CostEntree (09.00 tot 23.00) (entry, 09:00 to 23:00)€50As of Oct 2026
AccessBooking with a fixed arrival and departure time is required; textile-free every dayTimed tickets12+
Getting in
- Parking
- Free parking on site, with charging points
- Address
- Westbroekse Binnenweg 2a, 3612 AH Tienhoven
Entry, hours and rules
- Entry
- Entree (09.00 tot 23.00) (entry, 09:00 to 23:00) (Published as 'v.a.' (from). Booking with a fixed arrival and departure time is required)€50
- Entree avond (vanaf 16:00 uur) (evening entry, from 16:00) (Published as 'v.a.' (from))€40
- Hours
- Mon09:00-23:00
- Tue09:00-23:00
- Wed09:00-23:00
- Thu09:00-23:00
- Fri09:00-23:00
- Sat09:00-23:00
- Sun09:00-23:00
- Swimwear and rules
- Textile-free every day: "Het dragen van badkleding is niet toegestaan" (swimwear is not allowed), and the operator says it has no swimwear days. Bathrobe required in the rest rooms, restaurant and on the terrace. Phones only in the reception area; no photos or filming. Silence in the saunas.
- Children
- 12 and over. Under-12s have no access; ages 12 to 18 only with a parent or carer.
- Tickets
- Timed entry slots, book ahead
- Official site
- thermenmaarssen.nl
- Facilities
- Indoor poolOutdoor poolSaunaSteam roomChanging roomsShowersLockersRestaurantParkingStep-free accessNaturist areaTowel hire