Thalasseo is a French online travel agency founded in 2005, specialising in thalassotherapy, spa, thermal spa, and wellness stays in France and across the Mediterranean. The platform partners with over 300 carefully vetted establishments to offer curated wellness packages — from thalassotherapy cures and anti-stress spa escapes to fitness, beauty, and preventive health retreats — at negotiated prices. With more than 1.5 million travellers served, Thalasseo is established as France's leading wellness travel agency, combining expert product curation with a straightforward online booking experience. The company also serves corporate works councils (CSE) and gift voucher purchasers through dedicated offerings.