Mangalia is a city and a port on the coast of the Black Sea in the south-east of Constanta County, Northern Dobruja, Romania.

The municipality of Mangalia also administers several summer time seaside resorts: Cap Aurora, Jupiter, Neptun, Olimp, Saturn, Venus.

Mangalia is characterized by a moderate maritime climate (annual average temperature 11°C (52°F) - one of the highest in Romania) with hot summers (July average over 21°C (70°F)) and mild winters (January average 1°C (34°F)), Mangalia being the country's second place, after Baile Herculane, with positive average temperatures in wintertime. Spring comes early but is cool and autumn is long and warm. In summer, cloudiness is reduced (about 25 sunny days in a month) and the duration of sunshine is of 10-12 hours a day. Annual precipitation is low (about 400 mm (16 in)).

The sea breeze is stronger in summer. The natural cure factors are the water of the Black Sea, which is chlorided, sulphated, sodic, magnesian, hypotonic (mineralization 15.5g), the sulphurous, chlorided, bicarbonated, sodic, calcic, mesothermal (21-28°C) mineral waters of the springs in the northern part of the city, in the area of the beach between Saturn and Venus, the sulphurous peat mud, rich in minerals, which is extracted from the peat bog north of the city (expected to last another 250 years) and the marine climate, rich in saline aerosols and solar radiation that have a bracing effect on the organism.

The resort has a large, fine-sand beach developed for purposes of aeroheliotherapy and wave therapy, as well as high seawalls with a specific microclimate where one may benefit from inhalations of saline aerosols having therapeutic effects.