Thermen Maarssen
Tienhoven, Utrecht
A textile-free wellness resort beside the Maarsseveense Plassen, with a wide choice of saunas, indoor and outdoor bathing and waterside relaxation. The sauna gardens and bathing spaces offer a quiet counterpoint to the city, with restaurant facilities for a longer day visit.
Nudity policy
Textile-free spa
The operator confirms that swimwear is not allowed in the saunas or pools and that the resort has no swimwear days. Sit or lie fully on a large towel in the sauna and wear a robe in restaurant or shared relaxation areas as directed.
The operator confirms that there are no swimwear days: swimwear is not allowed in the saunas or pools. Wear a robe in restaurant and relaxation spaces as directed.
Facilities
- Sauna: On-site facility; follow the dress rules for the particular zone and visit date.
- Steam room: On-site facility; follow the dress rules for the particular zone and visit date.
- Pool: On-site facility; follow the dress rules for the particular zone and visit date.
- Showers: On-site facility; follow the dress rules for the particular zone and visit date.
- Jacuzzi: On-site facility; follow the dress rules for the particular zone and visit date.
- Restaurant/Cafe: Restaurant, reception and some relaxation spaces require a robe or other cover.
- Parking: On-site facility; follow the dress rules for the particular zone and visit date.
Saunas and pools are always textile-free. Wear a robe in the restaurant and shared relaxation spaces as directed by the operator.
Access & visiting
Book a day, timed or evening thermal admission through the operator. No hotel stay or club membership is required. The resort is always textile-free; reserve any treatment separately.
Age & supervision
The current FAQ permits visitors from 12 years. Visitors aged 12–18 must be accompanied by a parent or guardian; Berendonck also asks for identification. This is a quiet wellness setting rather than a children’s leisure pool.
Age policy sourceWhen to go
Open year-round; check current opening times and any maintenance notices before booking.
Directions & Parking
Getting there
Navigate to Westbroekse Binnenweg 2a, 3612 AH Tienhoven, Netherlands. Follow signs for the named thermen reception, not a neighbouring hotel or recreation-area beach. The property marker identifies the spa itself; the operator’s street address is the best arrival destination.
Parking
The operator confirms parking on the property within walking distance of the entrance. Follow the signed thermen parking route and current instructions at the barrier; verify any charge when booking rather than assuming public recreation-area parking covers the spa.
Finding the naturist area
Check in at the main thermen reception, change in the lockers/changing area, shower and enter the signed sauna and bathing route. Leave swimwear in your locker and use a large towel in the sauna. The nude facilities are inside the managed resort, not the adjacent public lake shore.
Where naturism applies
The sauna and pool areas inside the resort are always textile-free. Wear a robe in the restaurant and shared relaxation spaces as directed. The access road and adjacent public recreation area are outside the spa.
- Bring a robe, a large sauna towel and slippers, or check the current rental options.
Access guidance checked 2026-11-12. Follow current signs and any instructions from the venue or land manager.
Sources & last check
Location, facilities and nudity policy checked against these sources on . This is a desk check, not an on-site inspection.
- Operator — facilities and photographs
- Operator — current dress code, ages and access
- Operator — address, arrival and tariffs
- Named property location reference
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